I am running 4.2.3 build 20170121 on my QNAP TVS-871 NAS, I have had no problems, I do NOT run Sooloos, I run Roon to an 818v3 with no issues.

My understanding is that Roon currently uses the Sooloos protocol to talk to Meridian devices so not sure what the issue is going forward, they could adopt Roon's RAAT protocol as others have?

Russ