**It could be developing a motor problem, but one episode of humming doesn’t establish that.** Humming usually means the motor has power but cannot start turning.

A plausible explanation is that you freed a jam with the Allen key, while the motor was still hot from the stalled attempts. The popped reset button supports an overload event. InSinkErator’s troubleshooting guidance calls for freeing the shaft and allowing the motor to cool before restarting. [Manufacturer guidance](https://support.insinkerator.com/app/answers/detail/a_id/515/~/fixing-a-jammed-garbage-disposal)

The useful distinction is what happened after your reset:

- **It went silent:** overheating and the overload protector could explain the delay.
- **It continued humming while the shaft turned freely:** cooling alone is a less complete explanation. An intermittent motor starting fault becomes more plausible.

Since this followed cabinet work, check for debris that could have entered the disposal. Disconnect power first, use a flashlight and tongs, and keep your hands out of the grinding chamber.

If it now starts promptly and runs normally, monitor it. If it hums again, switch it off immediately. Repeated humming with a freely turning shaft warrants inspection; at approximately 20 years old, replacement would be a reasonable choice if an internal motor fault is confirmed.