Well this has been happening for quite a while now, and 3 times in the past 10 minutes whilst on the phone to my girlfriend. We'll be talking and suddenly it'll just go quiet and when I look at the screen, the call has been disconnected 
It's never happened before, and she has never had it happen with anyone else, and I've had it happen with one other person, so I think we can safely assume its my phone that is causing the problem...
Anyone know of a fault/fix for this please?

It's never happened before, and she has never had it happen with anyone else, and I've had it happen with one other person, so I think we can safely assume its my phone that is causing the problem...
Anyone know of a fault/fix for this please?