I use a Surface3 attached to a docking station. For an unexplained reason my external speakers quit working or more specifically no sound is transmitted through my external speakers. The speakers show as connected and active according to the tablet but the sound comes from the tablet speakers. when I plug the speakers directly into the tablets jack, the speakers work fine. The connection is lost between the tablet and dock. This is my second new dock and the speakers have been changed. When I initially switched to this new dock the sound came back to the speakers but for an unknown reason quit a few days ago. I cannot find any setting to remedy the situation. Any Ideas welcome.