Black spots appear and words disappear

Lubuntu 20.04. Sorry for bad English, I’m from Russia.
It is not clear for what reason, suddenly from time to time (in almost every session) such a problem appears. Photographed with a camera. Look please. I have to restart my computer to continue working.

Could you just please upload the pictures here? They’re broken and don’t show otherwise.

Also we would need information on your system. Give us the results of sudo lshw -C video.

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