Short cycling... frequent starts and stops ... is a real motor killer, though.
I'll second that Reno!! My current screening room install has three motorized blackout shades, two for doors and one for a window, as wellas a drop-down screen with two sets of drop down masking.
The two door shades lost their memorized stops (the up and down limits are electronic) because the installers of the house control system kept short-cycling them!! Luckily, the motors didn't burn out.....
I have written delays into the control program for the screening room to prevent short-cycling from my end of the system. (AMX control.)
I have also had a few projector motors release the magic smoke from operators who "bump" the power switch to advance the film.