[onlyme]

Margateret I had this problem and then the signal went altogether. When I got a chappy out to it, apparently it hadnt been installed properly and rain had got in the cable and had leaked through. You could see all the rust on the box where the water had gone in so might be worth just checking that.

Didnt cost too much to sort but i could have neded up having to buy a new box, but luckily caught it in time