I don't know how to exactly describe this issue, but I will try.
It happens sometimes, once per 20 to 50 days.
This is what happens: part of desktop environment suddenly stops responding to user input. For example when trying to control opened apps (browser, file manager, text editor, etc), they do not react. Only thing that seems to react on my input is "start" button in left bottom corner. Audio playing in the background if it was turned on before the issue appears. It seems the apps are still running correctly, only front-end and ability of user inputs is partially broken. But still - when I open any app from the menu that I am able to roll up, the app does not react. I am forced to restart computer using "Start" > "Quit" > "Shut Down".
I usually browse internet or using Caja file manager when this happens.
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OS Linux Mint 20 Ulyana 64-bit
Kernel Linux 5.4.0-172-generic x86_64
MATE 1.24.0