Almost certainly a failed aerial.
Fairly easy to buy a cheap "puck" aerial (the powered-up-the-cable type) and connect to the RNS to test.
Deciding where to site it, on a double-glazed S8, isn't necessarily that easy though.
I found a solution a few years ago, but it involved soldering connectors in/around the boot (reference here: http://forum.a8parts.co.uk/showpost....91&postcount=8 )
Here's a close-up of it installed (on my previous S8). This location works fine and is effectively almost invisible.
I elected (at that time) to tap into the existing aerial wiring in the boot lid, but now I know more about the internals of an A8 and where to run cables, I would probably try to run the cable (with extensions if required) directly back to the RNS.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 15th November 2017 at 11:51 AM.
Reason: Additional wiring route comments.
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