Sound like the snubber capacitor across the table’s motor power switch has either failed or is undersized.
@bound4h, @testpilot called it on this one. There is supposed to be a bypass capacitor across the power switch contacts. It is there to prevent damage to the contacts when the switch is operated, as it eliminates arcing. When the switch arcs you hear the pop. Either the capacitor has failed or it was never installed. Once its in place this problem will be gone. The value is typically 0.01uf rated at 1000Volts.

