Out of interest Paul where did you take the switched live from. I tested the fuse boxes eitjer side of the dash and they didn't switch off even after time. I ended up running a cable from the rear power socket cables under the centre console.
I have had this issue in all three D4's. I was looking for a neater solution but couldn't find a suitable fused supply to use
Cheers
Glyn
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Audi S8 2017 Mythos Black
Previous 8's
Audi A8 V8T Sport Exec.
to 2017
A8 3 litre sport till 2016
Short walk on the MB dark side
A8 3 litre sport from 2010 to 2012