7 Pin Trailer Connection falling out of TV outlet

I had a similar problem where the umbilical came loose behind my motorhome at the connection from the car 7 pin connector. My remedy is to use velcro strap to ensure that the connection stays firm. 5 years of worry free connection. My issue is the umbilical is heavy duty cable like used on trailer trucks and is very firm and always has spring tension. My fix works great for us. I use velcro straps at both ends of cable. Good luck.