So when the keyboard freezes, does it freeze completely? Does Ctrl-Alt-Del work? If it does, can you start Task manager and see whether some process eats all of your CPU or memory? Does the Windows key open the Windows start menu?
If those don’t work, after a forced restart, do the logs in your Windows Event Viewer report any weird errors just prior to the restart that would give us a clue as to what might be the reason?
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