This happened to me on my first DD flight. I used a cardboard tube charge container that Wildman carries, and left it dangling a few inches in the lower section. It must have gotten fouled up with the shock cord, because after the flight we saw that the wires were yanked out of the terminals. No apogee event, but the flight was saved by the motor backup and the main event worked. Learned a lesson on that one.
Back to the topic of T&T vs. external terminals, a while back I started doing T&T for the deployment charges on one of my rockets, but then found a bunch of Scotchlok connectors in my electrical parts box and decided to give them a try. Quick and easy, no need to strip the wires. Then I'll organize and tape up all of the excess wire, and the connectors, so they can't move or flop around, and are protected from whatever chaos is going on inside the tube. It's all I use now.
https://www.amazon.com/UY-3M-Scotchlok-Butt-Connector-Pack/dp/B01K3HZ2IO/