Hi,
I have an older 8-bit chip analogue Bartech unit with M-One motor. Occasionally I will be on a rest in-between shot and even during some shots, the motor will freak out and begin to sound like it's trying to move. It will not move but it will go on the fritz and sometimes twitch. All this happens also when my 1st AC isn't even touching the hand unit. That's what's so odd.