had mine since launch, (the 600 dollars ones) played it everyday, seen a LOT of bd movies, NEVER cleansed it, still works perfectly to this day, on the Xbox side i have two of them a launch one, and a elite one (also the very first elites) both work perfectly to this day, you want to know something funny the ONLY console EVER to have broke on me is a WII!!! my first wii (launch one also) got the video card defect that put a lot of distorted crap on screen still "playable" but got it replaced trough warranty (it was a problem whit the wifi receiver inside the console overheating the video ram or something they explained me in customer service before sending me a new one, and telling me NOT to let the wiiconnect24 connected 24/7)
If i where you i get a professional electrician to check the power outlets on your room and the state of the current in your house in general, you may have a problem whit "bad" power (brown power i believe is called in the states) in the meantime go buy a GOOD quality UPS whit filter and regulation and plug the PS3 in there