it freezes and get stuck for 5 seconds to 30secs and then comes back. It freezes more often when i look around fast and make quick movements
Sounds like drivers crashing... do you get a windows warning saying nvidia drivers have stopped working but have recovered or something to that nature? Might want to downclock the card some and see if that fixes it... If that does fix it... You will want to RMA the card. Sounds to me that your card is at the very edge of stable at stock settings, Most likely you will need to RMA it.
Oh and when you say it freezes for 5-30 secs... do you mean the image just stays on screen for that time or does it flash to black during that "freeze"?