I recently bought a Prusa MK3S+ and upgraded it with a Revo 6 nozzle. Had some great prints with a 0.4mm nozzle and then swapped it for the 0.6mm. Haven't had anything but garbage from it since. Swapping it back to 0.4mm and it's still garbage. Had mintemp errors, maxtemp errors, shutdowns and all manner of problems. I'm new to 3D printers but I think it might be the thermistor. I bought the Prusa as a kit, built it myself and installed the Revo6 successfully. I don't believe I've damaged it in any way and performed the change of the nozzle hot so there was no pulling on cold filament. Only thing I can think of is I might have damaged the thermistor wires maybe. Can anybody offer any suggestions please?