[TL OWNS U]

So a few weeks ago, I was playing on my PS3 then suddenly, the system shuts off on itself. I turn it back on and a message pops up that it wasn't turned off properly. So I checked my game data, trophies, etc. and they were all fine so I thought it was no big deal and it hasn't happened since...till today. I was playing God of War Collections and it did it again. And it gave me the same message about how it wasn't turned off properly. I'm thinking the system may have overheated. Is that the case, or is something wrong with my PS3?