Not knowing anything about your unit. I would suggest checking all the wiring to make sure the connections are tight. I had a problem with my invertor that was caused by loose connections. Then my question is does the refig. work when plugged in to shore power. Somewhere you have to have a transfer connection for power be it 120 or 12v. I would find that and check the connections. You may want to check your battery charger that's tied to the converter maybe its not keeping the batteries charged. The more I am thinking about this the more I can see a wiring nightmare.
Hopefully someone with direct knowledge will come to give you a better idea.
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Retired and never looked back
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