I will occasionaly get a No USB message using the factory BMW cable and an iPod Nano.
But it's rare enough that it's only a minor inconvenience, and it restarts by itself.
My next thought is to look at the Bluetooth adapters so I can access and control my iPhone's music without having to plug the phone into the bike.
'13 Dark Graphite Metallic K16GTLD
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from . . .