Two options - try to figure out whether the fault is the wiring to the boot mounted receiver, or the puck on the bootlid itself, or remove the sat nav unit and plug a GPS receiver into the back of the unit and stuff it somewhere behind the nav unit. If nothing else the latter rules out any headunit issues.
I gather water can sometimes get into the boot mounted puck, but more likely the wiring has got tired and is cracked somewhere around the boot lid
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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
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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