GNOME logout bug

On and off for a couple of months I’ve had a strange issue with GNOME; it will (apparently randomly) log me out perhaps once per day.
Here’s a Reddit thread where someone else experienced it: Reddit - Dive into anything
I’ve not been able to find any other examples of exactly the same behaviour.
The system is Fedora 40 (Silverblue) with AMD CPU and GPU. Another laptop I have with an Intel CPU and Nvidia GPU isn’t affected (I don’t know if CPU/GPU is relevant, though).
I’m not sure how to investigate this - is there anything in particular I should look for?

Do you have any crashes in coredumpctl?

I found this:

TIME                           PID  UID  GID SIG     COREFILE EXE                                                  SIZE
Fri 2024-09-13 15:24:49 BST 778044 1000 1000 SIGABRT missing  /app/bin/zypak-helper                                   -
Thu 2024-09-26 10:42:49 BST 370341 1000 1000 SIGABRT missing  /app/bin/evince                                         -
Tue 2024-10-01 10:41:10 BST 150456 1000 1000 SIGSEGV missing  /app/Signal/signal-desktop                              -
Thu 2024-10-03 13:58:32 BST 619467 1000 1000 SIGTRAP missing  /app/Signal/signal-desktop                              -
Thu 2024-10-03 14:55:55 BST 150547 1000 1000 SIGTRAP missing  /app/Signal/signal-desktop                              -
Fri 2024-10-25 14:43:30 BST 510500 1000 1000 SIGSEGV present  /var/home/gvurrdon/bin/signal/opt/Signal/signal-desktop  4.2M
Fri 2024-10-25 14:44:05 BST 510653 1000 1000 SIGSEGV present  /var/home/gvurrdon/bin/signal/opt/Signal/signal-desktop  4.2M
Mon 2024-10-28 14:52:00 GMT  99217 1000 1000 SIGTRAP present  /var/home/gvurrdon/bin/signal/opt/Signal/signal-desktop 28.8M

That last one is approximately the same time as one of these logouts.

Well a Signal crash is probably not relevant. I was hoping GNOME itself would be crashing, but it’s not. Exiting without any crash is going to be much harder to debug unfortunately.

Thanks - I feared that might be the case.
Unfortunately, I have so far been unable to spot anything which appears to be related to these crashes.