I forgot to mention in my earlier post - I believe that the intermittent problem was more severe when the garage gets hot - breaker panel location. The most recent failure was two breakers, garage outlets, which only had water softener on, but would fail even when not plugged in, and the refrigerator! Both Eaton and Pike's Electric both said that temperature would NOT cause this. This experiment suggests otherwise.
I opened the garage doors for about an hour from 9PM to 10 PM and turned both breakers back on at the end. They did not trip at all overnight. I replaced them both in the morning. It is a sweaty job in a 95F+ garage.
BTW. In each of the three cases, the fault indication was 6 flashes pointing to the BREAKER SELF-TEST as the problem! That further makes me believe that temperature played a role in the failures.
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