Nintendo switch and Vivaldi dac/upsampler

If the problem is the same from both this blue box and your TV TOSLink audio out, then it’s really an issue with the source, i.e. the Nintendo Switch Dock. I don’t think you’re going to easily solve this problem without spending more time and money :sweat_smile:

Maybe the following thread will give you some ideas - the Wyred4sound Reclocker seems to work well to address TOSLink issues into dCS systems.