PROBLEM with S4 shipped two weeks ago:
Room temp: 60-70 F
Other 3 machines: Working fine
Problem: Runs for 2-3 hours, then the LCD lights up blue but blank. I have tried killing the power and then plugging it back in again, and it runs up to ~250 gH for a few minutes and then back to 0 gH/s. It is all updated. It keeps hashing momentarily at 1.8-1.9 then immediately drops to 0 gH/s.
Possibly bad sensor that thinks it's overheating? I have no idea.
What should I do? Flash firmware? Is this OK to do?
Flash firmware, then reimage SD card if still not working. I doubt either will fix the problem but its the first place to start. As you say, it sounds like something temperature based because its time based. Are the module temps okay? Could be PSU's temperature sensor, is the PSU intake vent clear?