As the tile says, on my hatch sometimes when I flip rear wiper to make one wipe, it doesnt make the full wipe, but stops somewhere in the middle, then I new to repeat for it to finish. Not a big deal currently but not sure what is the cause.

When it stops in the middle I would think the motor is on its way out.

Mine does that occasionally if I pull the stalk back before it's completely finished the wipe. I just assumed the electronics are getting confused and wait until the wipe is finished before pulling the stalk back.

I use it so rarely that its hard to tell if this happens only on start or even later, time will tell....