I have been having a similar problem the last couple of days. It started, possibly coincidentally, very shortly after I installed the Meridian app. I have Roon on a NUC directly connected to ID41. Multiple reboots of the NUC, 861, Roon app, tablet and phone left me still unable to connect. The Meridian app couldn’t find anything either. I uninstalled the Meridian app. Rebooted everything again. It now works most of the time. But has on multiple occasions lost the connection to the 861. Rebooting has helped each time. I can’t think of anything the Meridian app might have done to cause this instability. However, prior to installing the Meridian app the system had been pretty stable. Any thoughts?

Fire TV, Panasonic DP-UB820, Roon on NUC, UHD722, 861v8, centre 5200HC SE, front 5200SE, rear 3200, Sony VPL-XW5000, Grandview Cyber Series