When we had our 06 and it was maybe 18 months old one day the right door wouldnt close. It was snowing bad but the tracks were clean, so were the cables, nothing would make the door close no matter how hard I tried. Our 6 month old son was sitting in the seat getting a face full of snow, sleet and blowing cold wind at the time and we were miles from home, so I put my foot into the door jam and pulled like hell till shit started snapping and forced it closed.
Yes, got a bit of a hard time from the dealer about me breaking it but I said what the hell would you do if you were in the situation I was in. I got a 10 second pause and then they said ok, covered under warranty. Never had another problem with it after that and never had anything go wrong ever with the left side and we had that van for 10 years.
Point of my long winded ramble is you probably had some sort of defective part somewhere and it broke, shit happens, just too bad yours wasnt covered under warranty.
Like piggy said, keep it clean, lubed up and use it the way it was intended, and dont let it get to you.