One thought is this... the antenna in the ninja rotates with the ninja. You may be turning it just right to cause a reflection of the cameras antenna. You might try moving the cameras antenna a bit further away or up or down. I have one ninja that is borderline with reception and as it rotates it rotates out of reception. I have to then use a hand held remote and hold it in a new position to bring it back.
Just a thought.
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR