My alienware r2 m17 lags and changes keybord color auto + switches it off

In game (only HON - Heroes of Newerth) my alienware r2 m17 lags (screen goes darker for 5 sec every 3-4 minutes) and changes keybord color auto + switches them off, why is that? I cant figure that out. All other games work just fine, like witcer 3 etc.

Any ideas on what should i do?