**Possibly, but one episode of humming doesn’t prove the motor is failing.** Humming usually means the motor has power but isn’t turning; a jam can cause that and trip the overload reset. [Moen’s troubleshooting instructions](https://assets.moen.com/shared/docs/instruction-sheets/ins10663.pdf) describe this symptom.

A plausible explanation is that your Allen-key work freed the obstruction, but the motor was still too hot to restart reliably. InSinkErator says its overload protector may need up to 20 minutes to cool. That could explain why it worked the next morning. [InSinkErator reset guidance](https://support.insinkerator.com/app/answers/detail/a_id/516/~/resetting-a-garbage-disposal)

The useful distinction is **whether the shaft turned freely after you worked it loose**:

- If it was stiff or caught at particular points, suspect debris or mechanical binding. With the recent cabinet work, construction debris is worth checking for.
- If it turned freely through full revolutions but still hummed, an intermittent motor starting fault becomes more likely. Cooling alone wouldn’t explain continued humming while the shaft was free.

If it happens again, switch it off promptly and disconnect power before checking it; don’t leave it humming or put your hand inside. If it repeatedly refuses to start despite turning freely, replacement is a reasonable choice for a 20-year-old disposal. Its successful restart is encouraging, but doesn’t rule out an intermittent fault.