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Hello, I updated my smartphone (Xperia Z - C6603) to Android 4.3 and my SBH-52 to latest firmware and now have problem with battery on both devices.
On Android 4.2.2 I work with phone about 3 days and SBH-52 about 1 week. When I updated to Android 4.3 is problem more than one day on both.
Please help ! I do not downgrade. 
My SBH 52 Has the same problem but My problem began when i Update smart connect .
I tested remove updates, but still same problem. I think that is problem in system interval check SBH availability or support Bluetooth 4.0. (Sorry for my english)