Offhand this just sounds like a loose connection. I'd check your plugs at the receiver and the body to start.
I had a mk4 with a headlight connector that had a loose pin, on bumps sometimes it would go out and you could smack the housing from the outside to get it cooperative again. Could be something similar, but unless there's stuff you've touched in there it shouldn't be a wear item.
2 door or 4 door? If 2 door, I could see enough flexing of the receiver stalk making wiring loose, but that's a stretch. The 4 door receiver stalk is rigid by comparison.