I'd like to thank you for posting this on the forums, and say I'm sorry to hear that you've been experiencing some freezing when watching Ch4+1, it must've been driving you up the wall.
I've run some testing and can see some issues with the connection, and would like to arrange for someone to call out and investigate further for you. I've sent you a private message in order to get things moving with this, so please look to the top left of this page where you'll see a red envelope icon, click on this and you'll see my message.
I have sent another message for you with regards to the fault with channel 4+1. I am not sure if it is a related fault but You Tube is slow and when watching a film/video it stops and starts, there are no issues with it on my PC..