Blackwidow Chroma V2 keys not responding.

Hi everyone, Today I started to notice a very strange problem. There are some keys on my keyboard not responding anymore. The keys are following : Top row : ESC, all function keys (F1 --> F12) print screen, scroll lock, and the one on the left from 1/! (just under ESC) Did anyone have this problem before, and were you able to solve it? I have a color that lights up when I hit a button, and that isn't happening either, so I'm worried it's hardware ... Also tested it on another PC, same result.. Thank you in advance.