I suspect the newer breakers are more than just thermal overloads as they were in the past.
The larger breakers have electronic circuitry in them, not sure what it does, some have adjustments to fine tune the amperage and delay times. Possibly there may be something inside one of the breakers that was humming. If all is working, nothing loose, I would leave it until the problem can be found. Call out an electrician, and it's not doing anything, he can't diagnose it either, but bet he can charge for a service call!
Side note: Couple of years ago I was installing a 200a Square D I line breaker. It was a used one from Ebay, but still cost about $200. When I went to stab it in the switch gear, as soon as it made contact something hissed and gave a puff of smoke!
That was an interesting half-second to make a decision... Do I drop the breaker and run away? Or wait a second more and see if this blows my hand off? Then I thought if it's gonna blow it would have done it faster than I could run anyway, so I just pried it on in... It never gave anymore problem, still working, still don't know what happened.
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