Dose it stop on the first sweep, that is from driver side to passenger side?
Or
Dose it stop on the return sweep, that is from the passenger side to driver side?
Or
Both sweeps
Will, with the wiper motor still running, a push of the blade get it going again?
Sounds like you might have striped gear inside motor. Try lubricating the mechanism first.
So when you turn off the wipers at the stalk switch the always park in the center of the screen, if that is the case then the need to be synchronized by making adjustments at Nut 1 as described in this post so that the will park in their correct position at the driver side.