@audio-b-dog Just shooting from the hip here on your network issues. If you are connected straight to your ATT router and you have a TP-Link system, you might try using TP-Link for everything. I ran into an issue with my wifi extender added to my mesh system, and it was acting as a DHCP (assigning IP addresses) server, as was my mesh system. This created confusion and the risk of duplicate IP addresses. I did not read the whole network part of this thread, as it is lengthy, apologies if this is a repeat. I am very interested in the Meitner part of things, it is currently my aspirational DAC.
My thread on this issue: https://forum.audiogon.com/discussions/wifi-extender-and-mesh-configuration-tweak

