I don't have easy access to SDS. But to be clear, when they do stop when still switched on (to the II or III setting), they return to home position before stopping.
It's when they're switched to 0 during wiping they they often park an inch or two out of position.
I think parking an inch or so out of position is normal, isn't it? They're "ready" to wipe again when the sensor says so.
I wouldn't worry to much about that...
But, help me understand here, when they're in position II or III, they keep wiping until YOU select them off, right?
Because in II or III, if they stopped and weren't selected off, then I would suspect that the motor is at fault, or is being overloaded by the transmission.
I've not tried to grease/lubricate the transmission, but I'm certain that there are articles available on how to do it. I would use a white lithium grease. The transmission itself is crazy expensive, like, $1,000 when I saw it once...so, I would sure try to clean/lubricate it before I swapped in a new one...