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People! The problem is that your software version needs updating. A recently added satellite creates a glitch in the older software. Go to the Garmin website, load WebUpdater if you haven't already done so, and the updated version (3.8) will automatically install to your Garmin unit. I had the same symptoms, they have now disappeared and my Etrex Vista is back to normal.
11-08-07 I had the same problem with an etrex Vista. I spoke with Garmin, they said that a recently launched WAAS satellite is interferring with some models (he mentioned it is the models with a black and white screen). Garmin tech support said that they're working on a software patch but for the meantime switch WAAS off.
Call Garmin tech support with any questions or to find out about the software patch, 1-800-800-1020