Hi, everyone!

I faced a problem, and haven't found any solution online so far... (or even met anyone with a similar issue)

Randomly Excel keyboard shortcuts (not system) stop working.
Such combinations as Ctrl-C, Ctrl-V, Alt-1, etc. are still working, but nothing happens when I press Ctrl+`, or Ctrl+[, etc.

Sometimes,when I restart my laptop, these combinations work, but then randomly stop responding again.
Sometimes restarting the PC doesn't help at all.

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Somewhere I read that one of the possible reasons could be the system UI language...
Operating System version was Win10 Home Single Language (now upgraded to Win11). Issue with shortcuts didn't go away with upgrade.

System install language was Russian.
As you probably know, by default you cannot change system UI language on Home edition, so I used few registry tweaks to enable this feature.
Now my system UI language is set to en-US and same is my Office language.

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I wouldn't say I'm a newbee to a computer... But for several months already I cannot solve this issue, and decided to write here :)

Might anyone try to help, please?