Hi Carlos84,
First, I think there is a slight language barrier here. We need to define your exact problem. Let me give it a try and perhaps you can add more information.
1) Are you saying that when you change Voices through Registrations, you get an odd sound for a split second?
2) If one speaker is shutting down, the first thing to suspect is the wiring. Are you using the Genos speakers or your own external speakers?
Let's start there and see what we can do to help.
- Lee