You could try and put it diagnostics and run it manually to see if it still shuts off abruptly. I think itís unit off no lights, hold add time up and down then press power. You can cycle the tests with start. Might have a bad motor if itís split phase and itís stuck in start windings too causing motor to over heat. Simple test for that is start it, let it die, donít touch any buttons! then wait five minutes and itís thermal overload will reset then itíll start again and die. That would be a bad motor.