RV, I’m thinking that it may not be coincidental that problems involving multiple components appear to have arisen during a time in which connections were being changed. The connections involving RCA connectors, for which there is a brief instant during insertion or removal when the signal pin is connected but the ground shell is not.
When you were changing connections was everything powered off completely, as opposed to just being in a standby mode? For example, was the power switch on the rear panel of the Gungnir DAC turned off?
Also, by any chance were cheater plugs being used on the AC plugs of any of these components, to defeat the AC safety ground connection. Which would mean that the chassis of the component would have been in a "floating" condition, at an uncontrolled potential (i.e., voltage), if the component had power applied but was not fully connected. Including during that brief instant I referred to above.
In any event, good luck as you proceed. Regards,
-- Al
