Sony XDR-DS16iPN lightning dock not charging
I have a Sony XDR-DS16iPN dock for my iPhone 5 and since ios7 I receive the message "This accessory may not be compatible..." and it only trickle charges the phone. I place it on the dock at night and after an overnight charge it fails to fully charge. It maybe goes from 20% to 60% after 7 hours on the dock.
Before iOS7 it charged perfectly and I never received the error message but now it happens everytime I dock the phone.
Numerous emails to Apple have failed to even get a reply, let alone resolve the issue. It's not as if this dock is a cheap copy, it's a Sony so I would expect a lot more. I spoke with Sony and they advised me it was an Apple issue due to it working okay with iOS6 but Apple don't appear interested.
Anyone have any ideas, or experiencing the same issue?
iPhone 5, iOS 7.1