From memory there's a weakness in the wiring around the boot lid area on the soft top S4s. Might find some useful threads on AudiSRS that'll help to pinpoint.
The easiest 'fix' is probably to disconnect the factory antenna behind the RNS-E and just stuff an aftermarket one somewhere behind the unit - it may not have the best signal, but it should work fine
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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