Thank you Benjamin, for your response, and for looking at the history. Yes, I have a whole-house surge protector which was installed by the power company, Duke Energy, four years ago. In addition, the Nucleus is plugged into a Wattbox WB-300VB-IP-5 power conditioner with surge protection.
Re: the ethernet connection-- I am for some reason unable to wire the Nucleus directly to the modem without bringing down the entire network. As soon as I disconnect the Xfinity modem from the EERO Pro 6, the network crashes. The system was professionally installed and I’m not sure why this is happening, but I don’t want to mess anything up by fiddling around too much. (Btw, slight correction in my description of the signal routing-- the Xfinity modem is wired to the EERO mesh router, which is wired to the Pakedge switch.) In any event, no other devices in my home are losing network connection regularly.
I do not recall many times when my internet has been down over the past couple of years. Maybe once or twice. Roon has crashed or slowed down significantly on at least 100 occasions over this same period. HOWEVER, as I mentioned, I do have a lot of power failures and whenever the power fails, for even a second, it takes the Xfinity modem 5 or 6 minutes to reboot. That is undoubtedly what you are seeing in your diagnostics report which shows “>3s dropped out in the last 30s.”
Can you tell whether the Nucleus is operating from WiFi, or ethernet cable? The Nucleus is in the same cabinet as the Xfinity and the EERO, about 18" away. I’d have to think the WiFi signal is exceptionally strong in that location.
We could try reconfiguring the Nucleus to operate from my WiFi network, instead of a hard-wired setup, but in all honesty, I think there is a low probability that this situation is caused by network failures. No other device in my home theater system, or anywhere else in my home, has problems that resemble this in any way. It is very unlikely that the Pakedge switch would cause Roon to stop working for several hours and then recover on its own, and on other days slow down with delays of 30-60 seconds between songs, and on other days skip songs and cut out in the middle of songs. But, I am willing to try other things, if you feel it is necessary, to get this problem resolved once and for all.
Do you think the Nucleus could be over-heating? Would this show up in your diagnostics report?