Problem with Bumblebee backup camera

[SeattleYates]

I recently bought a backup camera system (the bumblebee camera @$149 and VSM kit @$425) from EAS. I had it installed by a local shop with whom I've been very happy in the past. When I first turn on the X5, the Nav screen flickers several times, and when I put the car in reverse, it periodically flashes/flickers, and the camera image is only visible intermittently (i.e., sometimes it's just a blank screen). But more disturbing is the fact that ALWAYS when the car is in reverse, there are white flickering horizontal lines across the screen...like the ones in this photo (which happens to be during a "black" period when no camera image is visible). Note: in the photo things look blue, but that's just the low-light photo - the screen is really black with white lines across it.

Is this normal? Is the problem/solution something obvious to any of you? Bad installation? Defective equipment? Any help would be appreciated!