Actually it may be your power supply going to your ps3 , ive been reading this thread and it sounds abit like what your getting ... I think what may be happening is your ps3 is running ok , but when you start playing games it puts more strain on the power supply which if faulty will cause your ps3 to shut down, then because your ps3 has shut down it makes your ps3 do the hdd restore(so i dont think its your hdd) then it runs ok again and the cycle repeats ,,,,,, this could also explain why when you left your ps3 alone abit before sony came to repair it why it worked for longer , because it had no strain on the power supply for a longer time before use.
suggestions , it could be the power cord itself or the power connection on your motherboard. Hope This Helped You
this is the thread i was referring to
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