Breakers sometime fail when they trip. If they are ground fault they tend to fail in more frequently and in a safe state ( which means it won’t close again). When changing the breaker, If you have a multi meter I would test resistance to ground on the wire you remove from the breaker. There should not be a path to ground if all fan/light switches are off. If you turn them on there still shouldn’t be a very low resistance to ground. If there is, you can at least narrow it down to where the issue is. I suspect it’s just the breaker failing after an actual problem.
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