[Clembo]

Mine work fine, like every other coupe (or vert) I've owned. Just checked and there is no lubricant on either of my plastic slides. I always request that the dealer NOT lubricate anything like door latches, slides, hood hinges, etc. Your dealer may have lubricated yours? If so, wiping them off with some solvent may help. You may have to do it more than once to get it all. If that doesn't help talk with the dealer - the spring-loaded parts inside the door may need to be replaced.

As stated, be extra careful with these doors in the wind or on a hill. Already have posts here where doors and front fender seams have been damaged by both. They don't make these things as robust as in the old days.