You may have the drive gear jumping a tooth on the rack! I had this happened on my Cedar Creek just recently. The dealer had to replaced both drive gears and the racks on the kitchen slide. My slide works perfectly now. This is something a dealer needs to fix to be done correctly.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 135K+miles