I am currently running a stock Ender 3 (ver. 188.8.131.52) with Octoprint (ver. 1.5.3) and it keeps stopping 1-2 hours into my prints.
I thought it might be an issue with my Pi so I disconnected it and tried printing off the SD card, same problem. I then switched SD cards, same problem. I then thought power supply so I ordered and installed a Mean Well PSU, same problem. Could it be the main board?
When it fails with Octoprint it gives a communication error, when it fails from the SD card the display just goes blank. In both instances the printer cools down.