When you do the tests turn off all double pole breakers in the panel. One leg can feed through a 240 volt device and give a false reading of voltage on the other leg.
I know what you're saying bud, but it's a very simple check when it happens. It could be a bad thermal in the main breaker or it could be a loose connection at the line side lug on the main.
Thing is that you have someone explaining what they think is happening, but they don't really know. If it was an inexpensive branch breaker, I'd say sure...change it out. Worst case, you'd have a spare. A new main will likely have to have the meter pulled and an electrician, plus the cost of the main. That adds up quickly.
Only problem with that is if the main is the problem with a loose connection, turning it off could bring the power back on before the testing confirms where the problem is.Not if you turn off the main, ???
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