This could very well be a now faulty EPB (Handbrake) Switch which forms part of the circuit and would give that fault if it was intermittantly failing, and hopefully if A8 Parts have a second hand one then you could swap it easily and see if it cures it for you.
Audi are notorious for EPB switches failing, our 4 Year old FL D4 just had one fail and it decided to not let me turn off the parking brake which was a problem when I was half way through customer meetings! Fortunately I had VagCom with me and used it to go into the brake module and tell the calipers to retract the brakes, and I then just left the handbrake off until I was home. a new switch from Audi at £50 fixed it and now all is good again
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Confidence is the feeling you have before you know better . . . . 
Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble 
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
Last edited by Architex_mA8tey; 15th February 2019 at 12:45 PM.
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