Ive got a HTC desire S and if im listening to tunein radio for example the connection drops when my screen goes off, its really annoying, same thing happens when im using instant messaging to, anyway to top this

Is this because you have it on wifi? how are connected to the internet? wifi does sleep when the screen goes off to save battery on most devices I think.

wifi and 3g

It sounds like the wifi is going to sleep, causing the connection to drop, that's all I can think of. Does it still happen if you turn wifi off?

When you are on wifi and playing a stream it's going to be using your home internet, when the screen is turned off that connection is going to drop and the app will have to re-connect via 3G, I wonder if it's timing out when that happens. Have you waited a bit to see if it re-connects by itself?

The best test is to see if it drops when wifi is turned off.

Be careful with 3G though, unless you're on unlimited or a generous allowance as streaming can use a fair bit.

Background data will probably need to be on considering lights out everything is background.

Ahhhh of course, I'd forgotten that.