Do you have water bottles in there? Water holds heat better than air. I assume you see the temp fluctuations when you open the incubator? That's going to happen. If you keep water bottles in there once you shut the door it should only take a few minutes to get back up to 89.
Also, I did some practicing before I had eggs in there to see what I could do if the power goes out. I filled up a gallon milk jug with the hottest tap water we have and I was able to hold the temps at 90 for about 8 hours. My incubator is the freezer part of an old fridge. It's just a good thing to know, especially in this little town, the power flickers every time it rains
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