I was working on the printer the other day and all of a sudden, T0 which was enabled and the extruder was on at a temp of 185C went to 106C. Not warning. I thought I blew a thermistor, so I swapped it and no change. I then try to use T1, and it was some outrageous number like 496C, but both didn't seem to care if anything was plugged in or not. I changed the code to use T2 and it worked, and T3 works correctly too, but I am unsure what happened to T0 and T1. Seems odd. Any ideas how to fix this? I'm using Marlin.