Hope this helps someone else out there having bluetooth connection issues - I've now put 900 miles on my XR. At around 300 miles I gave up on the OneWheel App because of the Bluetooth connection issues. At around 600 miles after an unfortunate nose-dive incident I started researching avoidance techniques, and after adapting to a new foot position technique, I now get constant connection to the App.
The most popular riding position (avoiding incidents) seems to be riding with your feet really close to the wheel as if you would with Air Fins. I ride regular, and tried that, but didn't like it. I've adapted to my front foot resting almost parallel with the wheel, my front heel touching the fender and my front toes angled away from the fender about 1.5" towards the front of the board. My rear foot is exactly the same orientation, but placed middle of back foot plate. I believe because my front feet aren't covering the bluetooth I now get reliable signal. Hope this helps someone else out without having to return the board!