Hello,
I tried using my printer recently, and when I went to heat up the extruder, the temperature reading would just drop out of nowhere.
I switched both of the thermistors to see if that was the problem, and the other thermistor acted the same way, so it's not that. It's somewhere on the board, or its a software issue. I'm using RAMPS 1.4 with the sprinter firmware, and I'm using pronterface to control it.
If anyone has any idea what is wrong, it would be greatly appreciated.