If it was mine (and I know it's not) . . . I'd turn every major appliance on in the house and then check both legs with a clamp-on inductive amp-meter. If nothing scary is found - I'd replace the breaker and see if things improve. You can probably find a new breaker for $25-$30 depending on what specific breaker you have. Being Murray brand does not mean a lot since they make a dozen different breakers. Look for the actual letter-code e.g. "MP", "MQ", "BL", etc. The panel will specify which breaker types it's compatible with.
I wouldn't work it hot. I'd pull the meter out to kill the power to the house and then replace the breaker.
Back to your original question - some breakers just go bad over time. The trip is activated by a thin bi-metal strip. Especially if in a cold damp area, or if the breaker has been overloaded several times and auto-tripped.
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