My iPod music would consistently stop, without warning. The dash would then say "No USB"... And then re-start again at the first song on the playlist, or simply freeze until I re-started the bike. This occurs without rhyme, nor reason (2013 GTL). Sometimes would go days without a problem, but then occur every few minutes.
I did some research, and others have reported the same problem. The supposed culprit? The "bargain" knock off adapter that I got on Amazon ($35).... SO, I bit the bullet, and paid BMW $88 for the OEM iPod adapter cord. Bastages!
I'll be able to report how it works within a couple weeks....
I would have tried the kludge of using a rubber band, back and forth over the two parts (figure of eight) to draw them together and reduce skakeage. I did wonder how you got an IPAD in there