My vu+ultimo 4k has gone wrong i think, need some advise to confirm this, the last few days whilst using the box i would get the screen go blank for a few seconds then come back on, like if someone pulled the hdmi out and put it back in, today it did it again but this time never came back on, i changed the hdmi, no good, restarted the box from the rear, no good, the screen on the box shows a channel but it's not on the TV, when i restart it the tv has the vu symbol and then vix but as soon as the channel shows on the box there is no tv picture, i'm on the latest vix image, any ideas? just to add the receiver is less than a year old.