Is it just your keyboard shortcuts that stop working or is it the actual command?
i.e can you right click on something and choose to drag or go to the FILE menu and choose save?
If it is just the keybord shortcuts then try a new keyboard or do you have some other program running that controls them.
If it is the actual command then I would try to re-install.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11