The other day I was driving down the freeway and my Z1 thought I was like 1/8 mile off the freeway on the right. It was re-routing around all these sufrace streets. This went on my whole ride home. It obviously had no idea I was really on the freeway. Next day, no problems. Anyone seen this issue?

Your actual position was probably about 1/2 off of the road and it's "intelligence" put you on to one road or the other, it just picked the wrong one. I like going into a parking lot (so it's not thinking you are on a road) and modifying the position to place me exactly where I am in real life. I think that just after that my position was much more accurate and stuff like that tends to happen much less.