I pretty much assumed it wouldn't work well. Notice that every time they demonstrated it the background was professionally lit and extremely simple, if not a plain color.
What it probably is is the auto iris (probably gain, actually) screwing it up. The iris/gain probably changes when you leave the frame to correct the exposure, then it goes back when you return, and it doesn't work because the background doesn't match.
If that's it, there's really no way to fix it, aside from adjusting your lighting until the camera's exposure doesn't change when you're in/out of frame.