It is an old problem in an old thread and it still persists
Happens with any keyboard
I might sell tickets for people to line up and witness…LOL 
I now use Avira for virus checking and run ccleaner sometimes
If it is not a virus and it happens when you use any program after a while, and assuming that it is the same computer, could be a hardware problem. Not the keyboard but maybe the motherboard.
You tried with different keyboards so you might have tried also different connections (PS2, USB…)
If all of them USB, I assume that you’ve tried different USB ports
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