I have a problem with the Bluetooth. I can make one phone call through Bluetooth without a problem but then any subsequent calls aren't audible through the Bluetooth in the car even though the phone is still paired. For subsequent calls, I have to touch the Audio Output button on the phone during the call and select Speaker or Headset to hear the conversation. Videos (and I presume music) will play through Bluetooth without any problem, both when the phone call works the first time or when the phone audio isn't working. I had the Sony Z5 in the same car previously and had no problem at all. Having been a software tester in the IT industry, I've gone through numerous steps and procedures to see if I can fix the problem but no luck. I thought maybe an app or a setting I disabled might of caused the problem so I did a factory reset on the phone and only signed into my Google account (without installing anything else) but still had the problem. This is a big problem for me as I do a lot of driving for my work and need this working. Can anyone help?