Hi, my UM2E would intermittently throw an ER3 error in the middle of a print. I've read many of the related posts and followed their suggestions. I have checked (visually, connections, moving the wires, and measured the resistance (about 25 Ohms)) the heater cartridge and it seems to be fine. If I reset the system, it would start heating up again but not always. Sometimes when I tried to preheat the nozzle and measured at the heater 1 terminals, the voltage was zero. Another time while preheating, the system would get out of the preheat mode by itself. I have tried Cura 3.3.1, 3.4.1, and 3.5.1 but the problems seem to persist. Any ideas on what's wrong and what should I do to troubleshoot next? Could there be multiple issues? Thanks for the help.