I have used 4 Xitel Pro Hi-Fi Links to send audio to a Stereo A/V processor useing USB connections into Pro Hi- Fi and audio cables out , and they all work fine for a while and then ( No Sound ). I have contacted Xitel and they say there is a conflick with , MotherBoard ,Bios , Drivers and I have up-dated ALL. Any HELP? Thnxs for a Reply...