Set top box shutting down

Ever since signing up to the 360 service the set top box keeps powering off overnight . It doesn’t matter if it’s left in standby with the red light or fully on with the white light every morning it has to be switched off at the back and switched on again. Once it’s back to standby with the red light showing and the remote is used to power it up sometimes it crashes and we have to start again switching it off at the back and on again , it usually powers up at the second attempt. In settings One Power is off and the Standby timer is set to 24 hrs. It only happens overnight so it could be a software issue when it’s trying to update itself. The power supply seems fine and nothing else has changed all cables checked and the hub seems fine. Any suggestions welcome .

thanks Keith