Chosen Solution

My PS3 will randomly shut off during gameplay. I assumed that it was overheating and opened it to clean out all the dust. It still seems to be doing it no matter what I do. even after only a couple minutes of gameplay.What could the possible problems be? More importantly, how to properly diagnose it?

check to see if its over heating, because sometimes it doesn’t work right, then turn it off wait for 10-15 minutes then turn it back on