I have a 2009 MacBook Pro 15". I updated the RAM 4 years ago and 1 year ago i replaced my HDD with a Samsung 840 EVO. During this month I'm having some issue because the MacBook shutdown by itself for no reason. It's not overheating because I can happen while I'm only using simple programs. It's not a kernel panic because I have no log after the shutdown. I only got 2 kernel panic due to I/O and NVIDIA card, but this is not the main reason for my issue since most of the time I have no logs. I checked the console and I saw the shutdown code -62. I did reset PRAM and SMC but nothing changed. The AHT gave me this result 4hdd/11/40000000:sata(0,0) but as I red it's normal with some SSD's. What do you think about it?