I have the One X and have real problems getting it to stay connected to my car. I have a 2010 Renault Megane which has bluetooth fitted from the factory. I can get the car to connect to the phone with no problems what so ever. However, after a few minutes it dis-connects itself, then re-connects itself. This will continue for the entire journey. Its annoying as the radio goes off every time it does it. I had a Desire HD previously and it worked perfectly, never had a problem. This leads me to thinking that it is a phone issue not a car issue. I also have the bluetooth setting set so it is always visible when switched on. Any ideas?