In the other thread you mentioned that you were going to try a different a streamer. I also suggested trying a different digital input on the DAC. Did you ever test those situations?
Finally, can you tell if the ’glitchy’ DAC actually loses connection due to jitter? For example, on the Benchmark DAC3 B, the input light will flash if sync is lost. Does the other DAC give you some sort of indication that the connection is bad?