I am having an issue with the fbe200 in which I plug in the output from the mixer and it works perfectly fine for about 1 hour. The output of the mixer is consistent and there is no change in the settings. Then after the one hour, the sound suddenly goes very soft. Even a reboot of the fbe200 would not solve the issue but a reboot should not be needed. I have bought a second fbe200 and it still does the same thing. any help in fixing this would be appreciated.