I am having a problem with the hot end. I turned the printer on this morning, loaded my file, then set the nozzle and bed temp then hit set. The nozzle reached about 175 (my target was 185), then all of a sudden it just shut off and the temperature started to decrease. I haven’t been able to get it to start heating again. Did something short circuit or do I need to replace the thermistor (I hope not). I’ve checked all the connections I can without removing the hot end setup.