I have an Aristo SD45. I am using a digitrax decoder and a Phoenix 2K2. I use a NCE system. Here is the problem; my sound system is erratic. It will come on when I put the engine on the track but after a few minutes it will go dead, no fade out just dead. If I lift the engine off the track, the sound will start up again but it will shut down. I checked the board with the computer interface and all seems well. Another observation, on the program track with DCC applied the sound seems to work. With the engine on the layout and the sound is on, if I blow the horn or the crossing horn that action seems to have some affect on the board shutting down. The 2K2 is wired to the power pick ups directly on the decoder. Any help???