Its good that things are stable but I really would not recommend keeping any TP link switch in a network link where any Sooloos protocol runs (this also includes Roon talking to Sooloos and may even apply to Roon itself but I don't know about the Roon protocols) - they have known issues random Google - TL-SG105 multicast issue

As for downlink, was it you that had previous problems with a cable in a cavity or was it someone else?

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).