Z9X appears to be on - but is actually off

Hey all,
Over the past few months, my Z9X has appeared to be on - but is actually off.
The symptoms are:

• VFD showing the time (old time)
• Red light on

If I hit power on the remote, then it initialises a boot sequence.

For reference - I keep mine on 24x7 as library updates interfere with my movie watching.

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