mine was doing the same thing a few months ago the car would start and then cut out straight away, the immobiliser light would flash each time, started happening just once a month on the driveway then became more frequent, wouldn't start at work one evening with out jiggling the key each time and being very patient.
There is solution to this is to swap the cable out, inside the steering column cowling you can change the immobiliser wire, if you have VAGCOM it should show as a fault for Key Signal in the ECU
Locate the wire/cable, something like £11 new from audi, if you google it you can track down a guide and part number (sorry don't have it to hand ) this can then be swapped over with the old one, giving you perfect signal and new contacts again each time you start the car
its just wear and tear but very annoying
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Audi S8 D2 #ronin
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