You may need to reprogram the slide controller or update it with a new model. I was having a similar issue with my kitchen slide in my 2016 BSS. Upgraded the controller to a newer revision and have not had any more issues. The programming process teaches the controller how much energy it needs to move the slide. (My understanding)
Give Newmar a call and they can walk you through the process.
Tom Wilds
Blythewood, SC
2016 Newmar Baystar Sport 3004
2015 Jeep Wrangler 2dr HT