This has been bugging me for quite a while. Whenever I use Adobe applications on my Surface Pro I would use the modifier keys a lot (shift/ctrl/alt) and they get "stuck" after pressing them down for approximately 8 seconds. Also the spacebar gets stuck (not sure if that is considered a modifier). It's not limited to just Adobe softwares, for example when typing this I held the shift key for 8s and it functioned as if caps lock was toggled. I know that those filter keys/sticky keys settings specify something like "hold down for 8s", but I've turned them off completely. I have re-installed the type cover drivers; still doesn't work. Any clues?