If it's live to only then you have a signal issue which you'll need to phone in for. If it's on recordings you'll need a new box as your hard drive is probably dying. Phone 150 free from a virgin phone or 03454541111
Sorry to hear you're experiencing freezing pictures, I have been able to locate your account and I can see it's showing signal issues so what I would like to do is send one of the team out to check things over.
If you click on the purple envelope at the top right of your screen you will see a message waiting for you with further information.