BMW e36 (M3) Diagnosing Faulty Window Motor - Symptoms (Video 2 of 3)

Hi Everyone. Apologies for bad video quality. Here you can hear the motor rhythmically slowing down or glitching as it goes up. This corroborates the issue when attached to the regulator. At each of those slow moments the anti-pinch feature will be triggered and the window will stop rolling up.
This confirms that there is no problem with the regulator (the scissor arm).
Video 1: • BMW e36 (M3) Diagnosin...
Video 2: • BMW e36 (M3) Diagnosin...
Video 3: • BMW e36 (M3) Diagnosin...