I’ve got a Lulzbot Taz5 with a SE print head, when heating it gets up to about 186 and then stops with E1 Heating Failed PRINTER HALTED Please reset. Sometimes it will get up to 230 (printing abs) and then rapidly cool down to 180 and again stop. I’ve checked the resistance of both the thermistor and heating resistor and they seem within range. Bed can be heated to 105 and maintain temp. What else can I check?