Our 2012 Bullet Premier gave us the first major problem a couple of weeks back when we were camping in North Carolina.  I noticed the slide out was not completely out on one end so we went to close it and re-open it and it retracted little over half way before stopping.  I got out and pushed it the rest of the way in while my wife operated the switch.  I called our RV service and got it in the shop shortly after getting back home.  Some how a pulley bracket was bent and caused the problem.  Unfortunately we are out of warranty and it cost $$$ to have it repaired.  I have no idea how it happened.