First thing to do would be to remove the lower fridge vent on the outside of the RV and check to make sure the power cord is firmly into the outlet.
If it's in properly and appears to be tight, remove the plug and check for any signs of overheating/ discoloration on the cord or outlet, and while the plug is out follow the cord to the control board and check the connection there too. Disconnect the RV from shore power , remove the face plate on the 120v circuit panel and make sure all the wiring connections in there are tight, particularly on the fridge circuit breaker.
Sounds like the controller is not getting good steady 120v power for some reason.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.