Sliding driver door

Loses power to open and close. Tried dash reset, nothing. Checked fuses, all ok. Tried battery disconnect three times, door opened and closed several times, all three times. Then stopped working. Cleaned and lubed the rails and wheels. Had times when rear latch didn't draw door completely closed. Times when rear latched, but then released after a few seconds. Door stayed closed, just rear popped out 1/4". Middle roller moves in and out, but no more than passenger side that I can tell.