Switch the motor off and stop feeding food. A disposer should not keep grinding without the water flow required by its instructions, even if it still sounds normal.
What the observation tells you
Check whether this is a household supply interruption from a safe position away from the appliance. Do not compensate by slowly tipping cups into a running opening or repeatedly restarting it. Food remaining in the chamber may need attention before the next normal session.
A useful next step
Once a reliable supply returns, follow the manufacturer's restart and clearing guidance. If the unit stalled or became noisy during the interruption, obtain advice before using it again.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.