Superb combi, build date 13/4/2015. 1.4tsi S model. Rear wiper occasionally stops half way across the screen, taken car to local dealership, they tried it twice, both times it worked correctly, I said, I did say occasionally it stops, I was then told to take a photo next time it happens, to prove it. Any ideas what is causing this issue.Thanks.

Had on mine ,Drilled small hole into the tailgate trim where the rear wiper is and just squirted into the motor area with WD40 and its been fine since.