Strange Rear Wiper Stop/Start Problem

#1
Hey everyone,

Rear wiper isn't working as it should - see video below. Any ideas on what's causing this and what the cure would be? Sometimes it will stop 3 times across the screen in one swing of the arm.

 
#2
I'm sorry this won't help you but my 1999 Corolla rear windscreen wiper does EXACTLY the same - I'll post if I find an answer.
 
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