Saturn with a slow Windshield Wiper Issue?

I have a 2001 Saturn that just started to have an interesting problem. It is really cold out (-10 celsius or more) as of yesterday, and when I was on my way home from work, I went to clean the salt from my windshield, and the wipers went up and started to work, but were only inching up a bit at a time. They stopped halfway up and would not move further. I thought something may be frozen, so brought it into my heated garage overnight. This morning, they moved fine in the garage and for few minutes after, then after 10min on the highway, they started acting up again. The fluid is not frozen, squirts fine and is -45 rated. The motor sounds like it is trying to move the wipers and I see minor pressure on them, they just dont go smooth. Any ideas?

I'm taking it in to my dealer tomorrow to have them check it, but wanted to see if anyone else heard of this behavior or had to have their GM car fixed for same issue. I'll let everyone know the solution when I hear from the garage.