When I run my rear wiper it 'hangs' on the bottom of the window glass slightly and won't retract fully to its seat on the door. Anyone experience this? Is there a fix?

Sometimes when it runs it does 1/2 or 2/3 strokes and then returns to the bottom. Once it's been running a while it tends to be ok.

Thanks,
Jon

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2005 Liberty Sport CRD
Cleaned MAP sensor, ORM, ELM327 Bluetooth OBDII reader with Torque Pro, USA Spec PA-11CHR iPod adapter (used Aux input for Pandora!)
Awaiting install: EVIC, air cleaner hose, and Saikou Michi Catch Can (like a Provent)

Did you hear about the guy who was hooked on brake fluid?
He swears he can stop any time.