After just over two years with my C-Max, I had my first problem last week. The liftgate wouldn't close all the way. It would close but the little motor wouldn't pull it all the way shut. It looked like the latch was in the proper position. A thread on the C-Max hybrid forum and the dealer service person agreed. It would need a whole new latch assembly.
The dealer where I bought it never returned my call. On the hybrid forum someone recommended Mac Haik Ford in Georgetown, so I took it there. They replaced the latch, did all the outstanding recalls/updates from the last two years, and fixed a seat belt socket which I had broken at no charge and in a day and a half.
So, big shout out to Mac Haik Ford in Georgetown (way north Austin).