Youview Signal/Quality Issues

I have had a Youview box for a few weeks now and ever since it arrived the signal and picture quality has been very unreliable and patchy, with pixelation, horizontal lines appearing across the screen and breakup in sound when viewing live TV and recordings. I have re-tuned all the channels several times, signal strength is constantly 80% and above, signal quality is 100% and i have tried several different aerial cables and this problem still persists.
If anyone has any ideas then they would be weclome. This seems to be for most channels but im noticing it most on BBC1, BBC2, ITV and their HD versions.
Thanks.

Thanks for the responses all, my BBC 1 is showing as BBC1 East E which would make sense as im in the north norwich area.
I managed to convince my girlfriend to ditch sky for Youview with BT and so far all i have had is complaints that it was a mistake, so im really hoping that I can find a solution to this to make it all go away
Im on ITV HD at the moment and seems ok, the occasional spasm but not as bad as the BBC channels.

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