I have used Kapton tape to stick the connectors together inside the cross tubes of my Burly and never had a problem, but they don’t get tugged on a lot.
I recall seeing a 3d printed clip here on the forums a while back. I think it eventually got uploaded to Thingiverse, but I don’t know that I want to send anyone there to look for it at the moment.
Edit - searching the forums turned up Dupont Connector Splice Lock