Iphone 4 volvo XC70 2012 Bluetooth Problem

My Iphone 4 is "forgotten" every time I am out of my new Volvo XC70 (2012) longer than a few minutes. Once it is paired, I can go out of the car for a little while, come back and it reconnects automatically.

But if I wait a few hours - it does not.

I have to Pair it again every time, which is extremely annoying.

Anybody?