Reserving IP addresses is the suspenders part of the ‘belt and suspenders’ rule. If the router is behaving properly, it shouldn’t be necessary. It only helps when the router itself gets in an ‘odd’ state. 
 

Well, and being good housekeeping for a network, but strictly, if everything is working properly, it isn’t completely necessary. 

You are not the only one. We have spent thousands of dollars on Sonos equipment and probably 20-30 hours in just the last 6months on hold with Sonos, trying to fix our problems, and researching on my own. I have never once heard from Sonos I had a router problem. This is insane that I could spend this kind of money and NOBODY with Sonos told me I needed an additional router? I’m a legally blind person and the effort it’s taken to just get music playing is absurd. I’m researching getting different music system. I would NEVER recommend Sonos. Soo disappointed. 

E-mail received today from Audioengine with subject “When Your Home Audio System Turns Against You: Broken Apps”. Points to lengthy marketing piece contrasting “the allure of a sleek, proprietary system” with “open compatibility and user freedom”. (Spoiler: They think open beats allure.) “SONOS” doesn’t appear even once, but they do point to the Wired article reporting on the May update debacle.

I fully sympathise here and find that Sonos equipment is utterly useless at connecting, whether wifi or AirDrop. I have actually given up and switching out to Bose. I have experienced nothing but problems with all of my Sonos speakers, literally every time I use one of the speakers there is drop outs, cannot find the speakers or god knows how many updates are needed for speakers. I have just come to use them now and my Ipad or MacBook cannot find the Sonos Play 5 that is next to me. All Sonos ever say is it’s my network that is the problem in one way or another, you’re meant to be a network specialist to get these working every time. I have had new routers, new Ipad, new phone, new laptops and even tried in a different house and all just experience nothing but trouble. I have Bose speakers and never have any issues, I have a cheap soundbar from a company called Majority and that works fine, but Sonos is just endless issues to the point I spend more time trying to fix the problems than actually using it so there is only one place for such bad equipment and that is the bin! How Sonos can actually sell these products when they are so poor then claim the issues are due to wifi or network is beyond me. Google is plagued with people having so many problems and yet they are never fixed.