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We have seen this in the past and lately, some as well. The common issues, seem to narrow down to: relay (typically work/not work; no power), then the motor itself or the wiper linkage (aka: the "transmission"), binds up and the joint become very hard or eventually impossible to move.
Some, try to fix the transmission and binding joints or just go ahead and replace it with a new one.
www.vwvortex.com
Some, try to fix the transmission and binding joints or just go ahead and replace it with a new one.

DIY: MKV Wiper Linkage Fix
The PO of my 07 Jetta tried to use the wipers when the car was covered in ice and they quit working working for him. The wipers would barely move any and then just stop about 4 inches up the windshield. The linkage has two bushings on each end and one had popped off the wiper motor. Mark...