I've looked at other threads but they don't really answer my question. We've only had our Humax less than a month. In most ways it's great, but one problem is that every now and then, when we switch it on, there's no sound. It's not on mute and the TV is not on mute either. The only way to get it to work again is to switch it off at the mains, sometimes several times, before the sound will come on again. Any suggestions? I'm going to contact the firm we got it from to see what they say.