Hi there can anyone shed any light on why my zgemma h1 is glitching on a few channels, all channels but a few are perfect just 2 of the movie channels bt sport bbc news and a bbc 1 all glitch really bad more like pixelating if that's a word, when I press OK twice the snr says 0% but on working channels it's 98% I have rescanned but same happens all the time, any idea's or help please, cheers.