The Lighting Controller

Hi,

i've bought me a box. I created a view scenes. Than I started life. It had worked and i was very happy.
After a view minutes, most when i clicked a new scene, there was no dmx-signal to the mirrors. After a view minutes, it worked again. And then, the same s****. I don't know what it is.
Ich use V6 with an MacBook.

Please Help me.

Sorry about my english. I'm from germany and my english isn't the best.

Thanks Andi