Maybe something in the Northeast? I was driving in Philly and NYC a couple weeks ago and my GPS had me driving through buildings, into water, etc. and kept recalculating. It was particularly bad in downtown Philly getting onto the Ben Franklin Bridge to go to NJ. My GPS is rock-solid reliable here in DFW, in Chicago, and other parts of the country, and has never acted up on me like that. Only in the Northeast.

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08 W251 R350
97 W210 E320
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86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
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75 W114 280