I've had a recent odd glitch with my BMW X5 satnav (2005 4.8is) which sounds remarkably similar and have read of a few similar occurences amongst factory fitted satnavs of a similar vintage over the past few weeks in BMW, Audi and other marques. Wondering if it has anything to do with satellite changes as they fall out the sky and are replaced or not, as the US is apparently not replacing them at the same pace as before due to financial constraints........some of the older units have software presets to the original satellites and appear to lose track for a while, later rectifying themselves as they lock on. Haven't driven the S8 for a while as have been using the X5', but planning to use the 8 as soon as I can do a driveway shuffle and get the 8 out and the X packed behind her, will check satnav then, its an RNS-D.
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