Peter,
you do not write if its a just stop and pause ( which indicates an electical issue ) or a mechanical issue
Oir 09 Cameo started the pause issue on doorside slide which indicated motor overload. By extending it an inch then bringing it back in we could eventually close the slide. Eventually the rear gear in the zipper panel mentioned in previous post stripped.
Age and increased friction was the cause as well as poor gear alignment.
Look at these previous threads I made for a cure. Pm me for more
rbw slideout gears ( orphan ) gears again
rbw sideout crown gears stripping
Max