Wiper Issue

Hey guys. I'm at a bit of a loss here;
When you use the SINGLE WIPE function of my wiper, it will wipe indefinitely for a random amount of time and then randomly stop on the windscreen and then the stalk is completely unresponsive. If you turn ignition off and on, it will do then 'work' again but with the same fault.

Once it freezes in the random place, the washers don't work either.

I have removed the motor and cleaned it up as per the leaking grease threads I've seen - no joy.
I've replaced the wiper motor. No joy.
I've replaced the wiper stalk. No joy!
If I remove the relays, the wipers stop working. I've swapped them around and it's still the same issue.

Where should I look next?!
 
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