Good morning
unclejohn! Sounds like it
may be an HDMI communication issue. As freddylq said, try another cable or maybe check settings.
In the past I have had similar issues with the asian import receivers. One did as you said, spontaneously rebooting itself. I have a
thread here where I modded it, adding a fan to keep it from overheating. It worked OK after that but one should not need to go to those lengths for new receiver.
Another receiver lost sound on channels as yours does, sometimes tuning to a channel on another sat and then back brought the sound back. Other times a full power down and restart was required. Others have worked OK but would not control a motor properly.
I no longer purchase the 'cheapies' and am happy with my decision. We are currently using an Edision Mio 4K Plus and it works VERY well. That model is no longer available though. I believe the current offering is the Edision OS Mini 4K, which is sold by Casey at
Edision OS MINI 4K DVB S2X H.265 HEVC E2 Linux FTA Receiver. He is currently out of stock but you could check with him about future stock or models if you are interested in upgrading to a more stable unit. Good luck!