Hi, I am a newbie to the forum. I have a pvr 9300t that I am having problems with. I had the message banner coming up on screen when the topbox was first powered up saying' The antenna cable is short-circuited' I have done a factory default setting and this appears to have gone, the problem which still exists is that the picture and sound keep 'dropping out' very briefly which obviously affects the veiwing. Having looked at the signal detection setting in the menu I have noticed that the quality indicator is varying between 100% down to 50%, the strength indicator is reading between 100% to 80%, does this sound like software problem or a physical repair? Any help gratefully received.