Many slide outs use current sensors instead of limit switches.. What this means is when the slide gets to the end of travel the motor stalls. Current increases and the controller says "OFF".
IF 1: Something causes the slide to "Stall" (Example if it hits a tree)
or 2: If the slide is "Sticking" (Lubricate, Lubricate, Greast the slide rails (see note))
or of the controller is set a bit "Senistive" current wise.
You get that "Try Try again" syndrome.
THe note: Be careful when lubricarting. YOu don't want to ruin carpet or other stuff with grease/oil stains.