As title, some hd channels, mainly fox, e4 and 5 have serious pixelation problems and sometimes audio distortion. It's been doing it for over a month now. Had an engineer over yesterday and he detected signal was high and he corrected it so it's well within correct parameters now. However last night the problem persisted despite the signal correction. Any ideas? Paying over £80 a month for a distorted picture isn't my idea of fun..