My hovabator is fluctuating approximately 5 degrees up and down, where it used to stay super steady throughout incubation. I'm suspecting the thermostat but want some experienced feedback. The thermostat is about five years old, and was used heavily for the first two of those. Then I had a couple bum batches that never developed, plus a couple really hard years personally during which I did not incubate. I just took it back up again this season. I may have been having the problems during those bum batches, but I don't recall. It's a Hovabator, standard model, circulating air. I'm going to check the fan too, and see if that could be the culprit. Appreciate any feedback. Don't want to spend $25 if it's no the thermostat.