I experience issue with browser tabs and Intellij based IDEs crashing with error "sigsegv". It is starting to pop always after a couple of hours of work. After first crash others occur more often and after another ~1h it is impossible to work.
Workaround is to log out and in again. This fixes problem, but is annoying and may be harmful if Intellij crashes during doing sth important. It happens both on KDE Neon and Kubuntu. I tried Firefox, Brave, Chrome and Vivaldi, all the same.

I know that this is somewhat vague description, but this "sigsegv" seems to be difficult to debug. Any idea where to look for?
Google says it's some low level error with memory management. Can it be KDE issue or better to look at Ubuntu's forums?
Will try working on another desktop for a couple of hours.

UPDATE #1
LXQt with KWin desktop seems to be working fine.

UPDATE #2
Disabled Activities, working only on one for a past couple of days and problem seems to be fixed.