My trusty RV mechanic "adjusted the" slide and we haven't had any further problem. I thought it might be a hydraulic valve, but it wasn't.
2015 38RL with MORryde IS, residential fridge, DW, washer and dryer, generator, and slide in slide. 2 A/C, 1 HP and a fireplace. Added 17.5 inch wheels. Follows a 2013 Ram dually diesel with 8' bed and Reese 20K.