Since updating to 22.04 - randomly boots out to black screen

[Jef]

Perhaps there is a similarity with the following topic :

Browser consistently crashes MATE desktop session

I've been having trouble with certain actions in my web browser crashing my desktop session. The screen will temporarily go black with a blinking prompt, then I'll need to login again and relaunch any apps that were running. Any ideas how to troubleshoot? I just did a clean re-install, and the issue remains on this laptop. I haven't noticed it on other 22.04 installations on other hardware. I can reproduce the issue with both Firefox and Brave browsers. Thanks in advance for suggestions.