PS3 Freezing And Overheating

I have recently purchased a Jailbroken PS3 CFW Rebug 4.80.1 (160GB Slim) on eBay a month ago, and after about a week or so it started freezing and the screen would just go out of wack. It seemed to get worse by the day and now i cant even play on it! It will do this about every 2-5 minutes after boot now and its really annoying me. https://www.youtube.com/watch?v=dDKfc7hN...