Random crashes

Hi everyone,
I use ubuntu 20.04. Sometimes I have experienced random crashes in two circumstances:
– when i play 3d games
– when i play videos with mpv or vlc

The screen freezes (mouse and keyboard don’t work), the monitor turns black for some seconds, afterwards the screen becomes visible again, but freezed.
I believe the problem is the video card.
What log file can I view to understand the cause after the crash?
Thanks

 

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