Sliding doors on NC9

[sfborn]

I have a 2017 NC9 and the 3 panel sliding doors do not stay in position when underway.  The sping lock at top of each door does not hold so the doors slide back and forth almost like a guillotine if someone had their hand in the door jam.  It appears the springs are not stron enough to hold the lock in place.  Anyone have this issue and a fix?  The dealer has been trying to fix it for months.