Started system and heat pump. Didn’t hear that sound. Check defrost. Didn’t hear that sound. Let system run for a half hour. Checked amps was steady at 6 A. Pulled the compressor wires off to check the ground. Everything is open so nothing is grounded. Common to run is 1 ohm . Comment to start is 1.9 ohms. Start to run is 2.8 ohms. Calculation on winding seem to be perfect couldn't find any issues today, if it happens again give us a call and we will come back and look at it. The sound from the video isn't normal.