Not sure if I need a new converter or.............

I have a Springdale TT with a Dometic fridge and the standard WFCO 3 stg converter. It's hooked up to the house so there's power in it.

Here are my Springdale's symptoms:

The refrigerator decided last week to shut down. But, it will will turn on if the M/W is being used or if I turn the hot water heater breaker on. Sometimes it will stay on for a day or so and sometimes it's stubborn and will turn off within a couple hours.

Now, when the fridge turns off, it doesn't kick it's breaker off. No breaker within the WFCO unit has ever kicked off. I just keep the water heater off since we don't use it so no need to pay the extra $$$.

Also, when it's on, the fridge works just fine. Keeps everything cold/frozen no problem. I've never used LP with it and actually gave my son the large tanks to use for his bbq & outdoor heater so I don't have them currently.

What do you guys/gals think my best course of action should be? Is there a way to just switch out the actual fuse part for the fridge or should I replace the whole unit or .........

Thanks for your expertise!!

Moved to Tech Issues forum from DIY.