I recently upgraded from an iPhone 4s to an iPhone 5. I have a Motorola HX550 Bluetooth Headset which worked flawlessly with the iPhone 4s. However, since upgrading to the iPhone 5, I frequently lose audio when in the middle of a call. I am not certain whether it is a full disconnect or just an audio loss. The person on the other end reports still being able to hear me, however, I suppose they could hear me speaking over another source even if bluetooth disconnected. The loss of audio is always preceded by a quick shrill noise, so I can easily tell when it happens. All I have to do to fix the problem is to select Audio Source on the call screen, temporarily switch audio back to the iPhone, and then switch back to the headset, and then it starts working again.
Is is important to note that I am not the only one experiencing this issue:
This is a link to someone using the Motorola H19txt headset experiencing the same issue
If you go to the Plantronics website and look at the "Ratings and Reviews" on the Voyager Legend you will see the same issue reported:
http://www.plantronics.com/us/product/voyager-legend (next paragraph is taken from the review since there is no direct link to the review.
Really nice Headset unless you own an Iphone 5. I own several Plantronics headsets and have always loved the quality/ performance. This headset seems not to be compatible with the new Iphone 5. In the middle of a conversation it will lose all incoming audio. This leaves you trying to switch audio sources really fast in order not to lose your phone call. Ive tried 3 legend headsets and they all do the same thing. Hopefully this gets fixed soon because the headset is really nice
Since this issue appears to affect multiple headsets from multiple vendors, I think it is fair to conclude that it is an issue with the iPhone5 bluetooth itself.
I am posting this as a new discussion as I don't see any other posts specific to this iPhone 5 Bluetooth issue. I would have reported this as a problem to Apple, but don't seem to be able to find a way to do this on the web. Hopefully they are already aware, but if not, maybe they will see i here.