It could be the refer. The electric heater element in the refer can develop a fault to hot or ground. Either will cause a GFCI to trip. If possible, disconnect the refer. Shutting off the breaker will not prevent a GFCI trip if the fault is between the neutral & ground so you need to disconnect both the hot & neutral to test.
If it still trips, I'd look for worn wiring that lets moisture cause a fault.
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Jon Vermilye
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