I had that problem, this is how I fixed it, and it was what the US rep told me to try.
If it is the Flash on clash shutting off, you can try to restore the default parameters on your soundboard using the Obsidian Launcher. If you don’t have this already, you can download the older version of the Launcher to use with your saber from our forums here
http://www.saberforum.com/index.php?topic=3693.0 Make sure the saber is turned on and then while the saber is already on plug it into your computer with a Mini USB cable. Then run the program and when you run the program please right click it and select "Run as administrator"
Then click Restore Defaults in the bottom right hand corner and then click Write Parameters so that it writes to the soundboard and this should fix the issue with the Flash on Clash not working.