I haven't heard of anyone else having this problem, what browser are you using and what game where you playing when you first noticed this?

first noticed at zombies, key started sticking or stopped responding frequently. then had the some with super crazy guitar maniac deluxe 2 and
everybody edits.

could solve it with clicking and pressing randomly, only happened on this site so far

Generally you need to click within the game screen for games to work.

bit more complicated than that actually

my keyboard starts mallfuctioning randomly only at this site and clicking within the games doesnt really work that well. sometimes it does but than 5seconds later its malfuctioning again.

didnt find a sollution that lasted longer than thirty seconds and im sure its not my keyboard/computer/internet

It's probably a problem on your side, considering you're the only one with this problem. Try a different web browser.