Probably due to voltage drop at the radio, caused by increased current from fridge.
If this is the case , need to increase cable copper cross section to the fridge. ie so fridge causes less voltage drop.
Sorry about that my mistake, Hope it didnt take up to much of your valuable time
I see one response to the issue in over a month. Perhaps a repost in the general part of the Technical forum might put it in front of others that have had your experience with your radio.
Just a suggestion to try and get you an answer.
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Regards Ian
Chaos, mayhem, confusion. Good my job here is done