I have got Retropie working and was testing an PS1 emulator. All was fine for 10 minutes or so, then lost the signal to the TV. After restarted the RPi and loaded up the emulator again the same problem reoccurred. I just seen to be losing the signal between the RPi and the TV! Does anyone have any ideas as to what is happening and how I can fix it?
I'm betting it's not just a display issue, and that it's overheating and shutting down, or otherwise crashing.
Test this by attempting to connect to or ping the Pi over the network; if it were simply a display issue, these connections would still work.
If it's crashing or overheating,
Test heat by venting, using a program to check temps, or slapping a tiny heatsink on it.
Check for crashing by reading in /var/logs for the appropriate time-stamps.
There is usually a small icon that appears in the top right corner for overheating (and another for under-voltage)