Software update 4/5 weeks ago to TV 360. Often when i switch box on it does a reboot for no reason. Also often there is no sound at switch on but switching box off and on restores the sound. I have no sound bar or any other audio kit connected. Also I note a slight audio sync problem. I had none of these problems with the box when it was a V6.
Why the auto reboot, why the loss of sound and why the loss of sync?
Sync can be adjusted in the audio settings. Is the box set to fast start or active start, don't know if that that might be anything to do with your other problem but try one of those if not already set to one.
Almost everytime I switch on the 360 box it is silent. Mute is not on. If I switch the box off and on again it returns with sound but sometimes I have to do this up to 3 times. This did not happen when the box had V6 software.