I downloaded and installed kernel-7.0rc from koji.fedoraproject.org; however, builds from 20 March 2026 onwards cause my Fedora 45 KDE Plasma system to freeze shortly after booting to the desktop. Neither the keyboard nor the mouse responds, and I am forced to perform a hard reset.
Report it https://bugzilla.redhat.com/
At present fedora 45 is rawhide and is the leading (bleeding) edge of development. users should always anticipate problems with that constantly changing version.
If you want something that is more stable then you should switch to either f43 or (Beta and soon to be released) f44.