I thought I'd share this tip with you all, seeing as how it works. I've had instances of a DIN plug not connecting securely. Sometimes it's ok & others it's not. When riding the power supply cable from the Aux connector by the bars always seems to work loose & not stay connected.
Solution:
I have found putting an O ring on the plug & rolling it carefully up & under the copper connectors to where they stick out to make contact with the sides works great. What this does is gives the copper connectors something to push against & hold firm in the AUX connector. Too thin an O ring won't achieve what you're trying to do & too thick won't allow the plug to be inserted, use an O ring that just makes it a firm push & you'll have no more issues of the 2 not staying connected.
I've had this solution on the bike for a while now & it's proven (to me anyway) hence the post.