My previous coach was a 2008 Mandalay 43A, and we occasionally had slide problems that sound at least partly similar. It's been a few years, but as I recall, the symptom was as you said -- slide would travel partly in, then stop and locks deployed prematurely. We had it happen more often on the streetside slide. In any case, I traced our problem to the sensors under the slide (in the frontmost storage bay under each) that should have registered when the slide was all the way in. The sensor was a thin plunger-type switch, maybe 3 inches long, that would open (I think) when the slide reached the limit of its inward travel. Because of corrosion (especially on the streetside one, which was located in the propane tank bay, and thus exposed to road spray), the switch would get a little "dirty" and think it was open when it wasn't. When this happened, all I had to do was work the switch by hand a few times to clear the contacts of any rust or dirt, and then it would work. I think I may have also found some loose connections in the wiring to that switch on one or both sides.
Good luck!
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Crabby Mike
2019 Coach House Platinum 261XL RT
towing 2016 Grand Cherokee Overland
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