Jeff,
I have had random spikes when a bird is on the ground or on top of the truck, but I see that as normal. I'm guessing that's what your referring to?

I'm talking about having a bird on the wing for an extended period of time at a constant height and seeing swings of 400 to 500 feet or more. From my experience with Eco mode when a bird is just on a soar the data coming back is usually fairly consistent with the actual altitude of the bird.

Lately the random glitch in the matrix has become a lot less random. I guess I'm just looking for that magic uninstall/reinstall, memory wipe, restore to factory default button. Just to make sure I'm not going crazy.
Ryan S