Awning extending while driving

Interesting that repair shop never heard of this before. My Carefree started extending on the highway a couple of years ago. Managed to pull over and get it back up and tired. Called mobile repair at the next CG, and they said over the phone they knew the problem. Sent two men out to repair. The awning motor has a square metal drive axle that drives a plastic connector on the end of the awning. Plastic cap rounds out and freewheels. Service techs "pinned" cap to drive shaft and no problems since. This past week end another Carefree owner had the same problem at the CG we were staying at, so it's not that unusual.