FYI, all.....After BMW service spent the day with my X5, they have determined that it is the NAV drive and have ordered the part. It is on back-order so I won't know for sure if that is my issue until the new drive is installed, but I'll let you all know once the work is done. The service tech said that he has seen the problem that I described "a few" times, and that replacing the drive fixes the issue.

I, on the other hand, am led to believe that the problem is with the GPS feeding inaccurate coordinates to the NAV. I can be in the exact same position two different times; however, the coordinate readout will be different for the exact same position each time, and the map will show me on different streets each time even though I'm really in the exact same spot. Therefore, the map is simply pulling up the coordinates that the car is telling it to pull up. I explained this to BMW service; however, they seem convinced otherwise. Confusing? You should have seen me trying to explain it to the BMW tech. I'm just glad he saw it for himself!

I sure hope that I'm wrong and BMW service is right. We shall see.