i have a zgemma h2.s with ipab build and line. As a general rule it works perfect. I have one issue, every time I watch a recorded programme from the external hard drive and then return to the tv I just get a black screen, I check the signal from both tuners and there is none and no tick in the lock, after a while (time varies) the signal comes back and therefore the channels. Does anyone have any idea why this could be happening? It's driving me nuts!!