I've got to disagree a bit. If it really is the regulators, replacing them yourself isn't that bad.The issue here is the window regulator has to be replaced. I went to the dealer last week with this same issue and that's what they informed me, BUT should you decide to have it replaced, check on eBay for the the part....and verify the part number as well. You will find many regulators for the hatch backs....do NOT purchase any of them that do not have the rails..from what I have heard, following installation they are a bear to set correctly.
Here is the part number directly from the dealership for the left (driver side) window: 1Y0-837-461-F Dealer price is $241.20 plus tax; installation $168.00 plus tax. I "think" the P/N for the right right is the same except it reads "462."
There is a video on this site somewhere about replacing the regulator...I consider myself pretty handy, but after watching the video, I have decided it best to leave it to the dealership techs.
By the way, the complete regulator assembly can be had on eBay for $208.00
Hope this helps...oh and one further item, prior to going to the dealership, I too lubed the rubber window guides with dry silicone...and it didn't make any difference.