I’ve never experienced what you’re describing. have you had technically competent confirmation of your suspicions?
a couple of very easy ways you can try on your own dac(s).
(1) while playing music, take note of soundstaging size (especially height).
change into another digital input on the dac. the music should stop.
then switch back to the original digital input. then dac takes a few seconds to sync up. music resume.
take note the size of soundstaging (especially height).
any difference?
(2) connect spdif coaxial interface between transport and dac.
while playing music, take note of soundstaging size (especially height).
disconnect coaxial cable. the music should stop.
then plug in again. then dac takes a few seconds to sync up. music resume.
take note the size of soundstaging (especially height).
any difference?
to perform these tests properly, i suggest you use a pure-audio optical disc player
Before loading the test disc, make sure you shut down and re-power up the player (to clear residual memory retention)
after the disc has been loaded and settled, then power up the dac
for this test, the dac must always be powered up after the transport has been refreshed and re-powered up, and then disc loaded.
Use track 1 only
Press play on the front panel
Avoid using remote control
Repeat the power refreshing (clearing residual memory) for each and every time you play the CD.