Three weeks ago the largest slide-out on our 38Q retracted all the way in the front, but left a two inch gap in the back.
Worrying about a safety problem I contacted Winnebago. They assured me the problem could safely wait for a solution until our mid August appt. in Forest City.
Still worried, I finally READ THE MANUAL. Here they give simple procedure for separately activating the front and/or rear slide motors. Problem solved. The whole thing took less than ten minutes
The moral: If everything else fails, read the manual.