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Exception debugging method
As explained you can identify there has occurred a problem with App. First, you should start to debug App under debugged condition(connecting with VS by remote control) and cannot but debug up to the point to be expected. You should utilize Call Stack and other information. However, for DMB App as there can be not only App problem but also driver problem Please check where it can be a problem with App, and check the driver routine to be beeped.