Oh dear, it’s yet another of these - ‘my system is OK so you must be a moron (usually implied)/not using it properly/aren’t nice to it/RTFM/you don’t know how to use it/it must be mains/it must be WiFi’ emails. There are a lot of them around.
Your blind faith in dCS products is touching but ultimately misplaced. They may be more reliable than most, but they do go wrong - as attested to in numerous parallel thread in this forum. Moreover, extrapolation from a single, personal experience to general statements or assertions is always unwise.
FYI, I have been building and using high end audio for about 45 years, was a BBC Research Engineer, use a mains conditioner, have a dedicated mains spur and a giant spike in my garden for earth.
Plus I have a custom 250 mbps fibre Internet connection with AmpliFi mesh WiFi routers. The dCS is hardwired straight to the modem with Cat 7s Ethernet cable. This system is as testably bombproof as domestic Internet and Wifi can get. All 20 or so WiFi or Internet mediated devices in the house, including other audio and video streaming systems, work fine.
Next, please?