Zgemma HS goes to sleep

Hello All
I recently set up my box thanks to help from here.
I have Wooshbuild flashed on box and everything works except:-
If I turn TV off overnight and box is still on, when I switch tv on in the morning it says no input connected to HDMI.
I have tried on different HDMI inputs but still the same.
Pressing buttons on the remote makes no difference and the only way I can get it to come back on is to power off then back on.
Can anyone suggest what the problem could be?
All help appreciated
 
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