Ok something is really wrong here. Got new unit directly from MS repair on Tuesday. Played on Tuesday night for a few hours and turned off (full shutdown). Played yesterday and turned off. (Full shutdown)
Today I decided to download and update some games so left it on for an hour then put it into stand by mode. Left it completly fine, come back just now about 6 hours later and as with the past 2 other systems the video signal has been lost. All resets as usual and nothing. I asked MS when I sent the second unit in what caused the issue but they wouldn't tell me.
And as with the other two this one can also stream through the Xbox app on Windows and it works so again the HDMI port will NOT send a signal to the TV. I'm getting sick of this now, it's been like 4 weeks of wasting time with no results.
As with the others, plugged into the wall. Tried different HDMI, power, TVs and all the same.