I turned my MV HT oven on this morning and it was showing a temp of 300°C. It's slowly coming down to room temp but at a rate like its actually cooling, but it's cold. I've had a few instances over the last 6 months where the sintered units came out under fired (opaque) and chalky white at the margins and I'm thinking now it's related to this. It would happen and then not happen again for a month or more. Any ideas whats going on? Thermocouple? Any way to reset?