Sometimes some keys stop working in one AppVM

Sometimes just few keys (arrows, delete, and maybe other) stop to work in all windows (Terminal, Firefox) of one AppVM (debian-11). Other keys work. And in other AppVMs seem to be fine. Restarting AppVM helps.

Did anyone experienced such behavior? Any ideas how to fix it?

Wierd, I didn’t experience this. Anything in the logs? (right click on VM in Qube Manager)

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Logs don’t say anything useful. (anything different from AppVM where the keyboard still works)

Interestingly just few keys have strange behavior. Delete, Insert (=Fn+Delete), arrow keys, Home, End (=Fn+arrows) don’t do anything. But PgUp writes / and PgDown opens context menu.