Maytag Gemini double oven range

Both of my ovens are very inconsistant in heating, sometimes when you set temperature, it’s accurate, other times it heats 100 degrees below setting and sometimes 100 degrees higher than setting. Do I need new heating elements or could the heat sensor be bad? I can’t imagine both ovens going out in the same way at the same time so I’m thinking it’s not the heat elements. Thanks

Here are your parts
Parts for MER6775BA - AppliancePartsPros.com

You seem to be missing a letter at the end of your model number so you will also have to use “Matching Model Numbers” on the left side.

Do I need new heating elements or could the heat sensor be bad?

I can’t imagine both ovens going out in the same way at the same time so I’m thinking it’s not the heat elements.
The same would apply to the oven sensors.
You could check them see the below link, look at 7, 8, 20 and 21.
http://www.applianceaid.com/electric-range-repair-topics.php

My best guess would be that the control board is bad.