Norcold 1998 model 9100 series

I have a 1998 Pinnacle with a Norcold model 9100 fridge. For some reason I can turn it on to automatic and let it run and it starts to cool. After a while I come back out to the RV and there are no lights on the control. I push the power button again and it comes on auto and ac. Come back later and there are no lights on. I then tried using manual mode and setting it to AC. Come back later and no lights on. Have to push the power button again. I have tried the tests that are in the book and everything checks ok. Anyone had this happen to them? Thanks