I have my fan working fine, and have had that running the whole time. I had the thermostat probe set up near the middle of the incubator, and hadn't moved it at all when that spike happened. I guess I will try putting the probe in the bin. It was just very strange that it was stable for days, then flipped out! If I see it spike or do anything crazy like that again I may have to try another thermostat I have laying around, I had just never had issues with the Helix before.