Rear stabilizer sparks, stopped working, now working again

[Timmer]

Hi all,

We are weekend campers with a 1.5 yr old TT stored inside a shed. We are getting ready for our first trip of the season after a long winter - hooking up the battery, getting supplies in the camper, etc. My wife noted we didn't want to forget retracting the stabilizers, so she went to do so. On the rear stabilizers she pushed the button and saw a "big spark" appear on the side of the frame where the wiring comes together inside a red rubber cover. After that the stabilizers wouldn't respond to up or down. I checked all fuses and couldn't find a problem. I took apart the rubber housing where the wires meet and all looked clean and connected properly. Our shed doesn't have lights and I was running out of daylight so I decided to look into it further the next day. When I came back the next day, it worked fine. I'm confused. Any thoughts?