Rear Windshield Wiper Glitch?

Hi all,

I just purchased a Prius last week after lurking on the forums for a while, but unfortunately my first post is not a positive one

My car was at the shop today for tinting and clear bra installation. On my way home, however, the rear wiper randomly turned itself on while I was on the highway. No matter what I did (flipping the REAR switch from OFF to INT, to ON, and back to OFF again), it still kept wiping, wiping, and wiping some more.

I'm taking this car into the service dept tomorrow morning so hopefully they can figure out what the issue is.. but does anyone have any ideas? I had a hard time talking due to a majorly sore throat.. but here's a vid I took when I got home:

 

Thanks guys.

This issue did appear just a few minutes after driving away from the tint shop, and again a few hours later that night as in the video. The dealership couldn't replicate the issue when I brought it in, so there was nothing they could identify as problematic or replace under warranty.

The good news, however, is that this issue hasn't occurred since I uploaded the video. I left the car sitting in an airport parking lot for two days over the weekend while out of town which might have helped. The tint shop says they work on at least one prius a week, and this is the first time they've heard of such an issue.

Nothing unusual happened during the 1hr commute to work today, so I'm cautiously happy things seem to be working normally again.