Member, Sport: Off DSC: On (>50 posts)
Join Date: Feb 2011
Location: Merton, WI
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My MKIII nav in my 2001 540i/6 did the same thing when it was cold (below 20F). It would work fine once the car would warm up (only after restarting). I did some research and what I found was the consensus said that the nav computer itself was going bad. I sold the car (not because of this problem) but had I kept it, I would have used the issue as a reason to upgrade to a MKIV nav computer.
Dig around on bimmerforums and you'll find some info.
2008 Volkswagen Passat Wagon (for sale)
2007 Honda Odyssey Touring
1999 Audi A4 Avant
1992 BMW 325ic m-technicII
1991 BMW 318i 4dr slicktop (receiving s52 swap)
1988 BMW 325ic with factory hardtop
working on buying an e39M5, just sold an 2001 540i/6.