There are a couple of possibilities.. I will cover just one of them, this applies to ALL slides, Hydraulic, Rack and Pinion, Cable car, ALL of them, brand does not matter.
One problem I have found is the switches used in many RV's can get dirty.. Now there are a couple different kinds of siwtches but slide outs often have SPDT center off rockers or toggles.
These switches are, to some extent, "Self cleaning" but.. if they get dirty enough, they won't self clean under load.
The solution is to remove the power from the switch, severl ways this can be done but just turning off the house batteries (battery disconnect) with shore power unplugged and generator off may be enough.
Now cycle the switch, say 50 times
Then restore power and try again.
Page 2: At least one popular slide out uses a current sensor system, if the current exceeds the threshold, or if it suddenly rises (Depending on the system) the controller assumes the motor has stalled and shuts off. LUBRICATION may improve operation here.
Home is where I park it!