laptop frozen when opening apps, debian testing with gnome

[Shalom Ben-Zvii Kazaz]

Hi
since the latest full-upgrade three days ago on my laptop the computer gets
completely frozen sometimes, yesterday got frozen few times when i tried to
open zoom. today few times when i tried to open brave browser. completely
frozen, need to shut down and restart.
i'm running debian testing for three years on that laptop, dell xps 15,
gnome desktop.
what can i do,check? i'm not so experienced, usually there are no problems.