First - extended thanks for the empathy and suggestions here on the forum. It is one of the reasons the forum can be a real asset to Naim owners.
I am in the midst right now of about 2 hours of dropout free listening. rjstaines (Rod, IIRC?) mentioned the channel, so I dug out some stuff I had jotted down when I had an ISP melt-down last year (at one point literally had 3 AT&T trucks in front of my house.) So I downloaded a wifi analyzer (per NFG) onto my phone and looked at all the "competition" and then logged on to my router and changed to channel 11, as it showed less traffic. Problem "solved".
I say "solved" because it is apparent that this is likely a temporary respite from the situation - with all the cable and fiber wars going on in my neighborhood, I have been convinced here that other measures need to be taken, since someone can buy a new router or extender and start competing for my bandwidth. You think people would check around the neighborhood for Naim streamers and give a wide berth for them...what is wrong with people these days?
If I can get time, I will call Naim support and investigate other measures. Airport Express, etc. and hope to come up with a final solution.
And Winky and others are probably correct that it is best to connect via ethernet, and only use the wifi for control functions. My home layout is really adverse to such, but perhaps I can come up with some solution. My home is slab on grade, so there is no below floor option, and I (thankfully) have almost no carpet, so I can't hide cable that way either.