Sometimes when switching windows kwin_11 crashes. Below is the journal log. DrKonqi does not start so no tracelog available.
set 14 10:10:44 elitebookvasco kwin_x11[25592]: Application::crashHandler() called with signal 6; recent crashes: 1
set 14 10:10:45 elitebookvasco kwin_x11[25592]: KCrash: Application 'kwin_x11' crashing...
set 14 10:10:45 elitebookvasco kwin_x11[25592]: KCrash: Attempting to start /usr/libexec/drkonqi
set 14 10:10:45 elitebookvasco drkonqi[28532]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 16777229, major code: 20 (GetProperty), minor code: 0
set 14 10:10:45 elitebookvasco drkonqi[28532]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 16777229, major code: 20 (GetProperty), minor code: 0
set 14 10:10:45 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 16777229, major code: 20 (GetProperty), minor code: 0
set 14 10:10:45 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 16777229, major code: 20 (GetProperty), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46476, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46477, resource id: 27263852, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46478, resource id: 27263852, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46479, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46480, resource id: 27263854, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46481, resource id: 27263854, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46482, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46483, resource id: 27263856, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46484, resource id: 27263856, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46494, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46495, resource id: 27263860, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46496, resource id: 27263860, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46497, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46498, resource id: 27263862, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46499, resource id: 27263862, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46507, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46508, resource id: 27263866, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46509, resource id: 27263866, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46510, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46511, resource id: 27263868, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46512, resource id: 27263868, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 46513, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46514, resource id: 27263870, major code: 55 (CreateGC), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 46515, resource id: 27263870, major code: 72 (PutImage), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5089:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5091:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5093:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5097:47: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5099:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5107:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5111:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5113:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5117:45: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5120:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/pt_PT.UTF-8/Compose:2:25: this compose sequence already exists; overriding
set 14 10:10:46 elitebookvasco kwin_x11[28530]: kwin_xkbcommon: XKB: /usr/share/X11/locale/pt_PT.UTF-8/Compose:3:25: this compose sequence already exists; overriding
set 14 10:10:46 elitebookvasco plasmashell[6116]: Could not find the Plasmoid for Plasma::FrameSvgItem(0x561e60a15e90) QQmlContext(0x561e5dfdd970) QUrl("file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global>
set 14 10:10:46 elitebookvasco plasmashell[6116]: Could not find the Plasmoid for Plasma::FrameSvgItem(0x561e60a15e90) QQmlContext(0x561e5dfdd970) QUrl("file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global>
set 14 10:10:46 elitebookvasco plasmashell[6116]: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationItem.qml:220:21: QML SelectableLabel: Binding loop detected for property "implicitWidth"
set 14 10:10:46 elitebookvasco plasmashell[6116]: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationItem.qml:220:21: QML SelectableLabel: Binding loop detected for property "implicitWidth"
set 14 10:10:46 elitebookvasco plasmashell[6116]: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationItem.qml:220:21: QML SelectableLabel: Binding loop detected for property "implicitHeight"
set 14 10:10:46 elitebookvasco systemd[5951]: Started dbus-:1.2-org.kde.KSplash@3.service.
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2656, resource id: 41943069, major code: 3 (GetWindowAttributes), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2675, resource id: 41943076, major code: 3 (GetWindowAttributes), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2676, resource id: 41943076, major code: 14 (GetGeometry), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2687, resource id: 41943079, major code: 3 (GetWindowAttributes), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2688, resource id: 41943079, major code: 14 (GetGeometry), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2707, resource id: 41943085, major code: 3 (GetWindowAttributes), minor code: 0
set 14 10:10:46 elitebookvasco kwin_x11[28530]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2708, resource id: 41943085, major code: 14 (GetGeometry), minor code: 0
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 1
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 3
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 4
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 5
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 6
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 1
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 3
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 4
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 5
set 14 10:10:46 elitebookvasco plasmashell[6116]: requesting unexisting screen 6
set 14 10:10:47 elitebookvasco systemd[5951]: plasma-kwin_x11.service: Main process exited, code=exited, status=253/n/a
set 14 10:10:47 elitebookvasco systemd[5951]: plasma-kwin_x11.service: Failed with result 'exit-code'.
set 14 10:10:47 elitebookvasco systemd[5951]: plasma-kwin_x11.service: Consumed 30.237s CPU time.
set 14 10:10:47 elitebookvasco systemd[5951]: plasma-kwin_x11.service: Scheduled restart job, restart counter is at 3.
set 14 10:10:47 elitebookvasco systemd[5951]: Stopped KDE Window Manager.
set 14 10:10:47 elitebookvasco systemd[5951]: plasma-kwin_x11.service: Consumed 30.237s CPU time.
set 14 10:10:47 elitebookvasco systemd[5951]: Starting KDE Window Manager...
set 14 10:10:47 elitebookvasco kwin_x11[28603]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 41943053, major code: 20 (GetProperty), minor code: 0
set 14 10:10:47 elitebookvasco kwin_x11[28603]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 41943053, major code: 20 (GetProperty), minor code: 0
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5089:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5091:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5093:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5097:47: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5099:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5107:48: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5111:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5113:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5117:45: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5120:46: this compose sequence is a duplicate of another; skipping line
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/pt_PT.UTF-8/Compose:2:25: this compose sequence already exists; overriding
set 14 10:10:48 elitebookvasco kwin_x11[28603]: kwin_xkbcommon: XKB: /usr/share/X11/locale/pt_PT.UTF-8/Compose:3:25: this compose sequence already exists; overriding
set 14 10:10:48 elitebookvasco systemd[5951]: Started KDE Window Manager.
set 14 10:10:48 elitebookvasco kwin_x11[28603]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 2621, resource id: 16777248, major code: 3 (GetWindowAttributes), minor code: 0