Hi. I was facing the same problem console. I decided to open it and do a vacuum clean (had some dirty). I removed and opened the power supply to clean and test. PSU was ok, then I started to worry. Thought o was a logic board issue.
With top and bottom panels removed I continued cleaning. Then installed back the HDD and went for a last hopeless test, but for my surprise it started up. [br]
I’m not sure about the root cause of the problem. Suspect about some dirt on PSU or logic board that was allowing some current leak.
Until the time I wrote this comment I played Gran Turismo Sport and Project CARS 2 for 4 hours with no problem.