We had a hard to find, sporadic beep as well. Finally discovered it was the fridge warning beep for losing 12v power. But it wasn't the battery. It was the propane furnace kicking on. Keystone, at least on my unit, put both the Dometic fridge and the furnace on the same 12v circuit, along with several other items drawing power. I ran a new separate 12v circuit for the fridge. Problem solved. You mentioned yours is a 2021, has it done this the entire time you've had it?
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