This is a problem with the ESC its self. A few guys at my local track, myself included had this problem. Even with the drag brake turned all the way off, it would still bring the wheels to a stop very quickly. I had to send mine out to LRP for repairs. It seems to be a bad batch. The Spheres I bought before that and after that have both been working flawlessly.

Contact LRP about your problem, they are aware of it.

I need to call them myself. They have had my Sphere for over a month now.