My Phat 40gb (which is upgraded to a 320gb) powered itself off twice in the space of 20 mins when playing on line on Friday evening. Now when I play its really glitchy, voices and graphics are slow.

FIFA 12, Crysis 2 and Joe Danger 2 work fine, online and campaign on Black Ops 2 won't play and just freezes my PS3 meaning I have to hard power it off. It did it this morning when I was using VidZone too.

Thinking its damaged my PS3.

Thoughts?