Is it a programmable type where you set the up and down limits? if yes, reset
Is it direct wired, or is it a wireless remote? Some of the wireless remote's don't work great. I had a wireless one for a year, then tossed it and added direct switches & wiring.
See what it does if you put 12 volts directly to the motor. Most of these simply reverse the wiring polarity to get up and down.
Since you get the same one inch of movement in each direction, I'd suspect the motor/shade assembly instead of the switch.
Let us know what you find
Fred