Bluetooth handsfree audio output problem

Hola everybody!

I'm experiencing something REALLY annoying with my iPhones since upgrading to iOS 7 (i'm now on 7.0.4, the problem has been there since 7.0.0 ..

When I have a handsfree unit connected through bluetooth, almost every time (but NOT every time) I make a call, I have to change audio output to Bluetooth Headset. What's even stranger is the fact, that is starts on Bluetooth, then changes automatically to iPhone, and I have to manually change it back to Bluetooth.

There's no problem when answering a call (using the button on the bluetooth headset).

The same thing has happened on three different iPhones now (two iPhone 5 and one iPhone 4s)..

If I use it with iOS 6, this doesn't happen...

So annoying!

Anyone have any tips?

 

Yeah, but.. This is happening on three different iPhones All have been rebooted several times, and I've unpaired and repaired at least as many times..

I would blame the BT-headset, if it didn't work correctly both in iOS6 and Android..