Added Boost, speaker dropping more

I’m in a 1k sq ft long and narrow apartment with 9 Sonos speakers all on WiFi, S2. My router is set-up in the middle of the apartment to try and give as even distribution of signal as possible. The space is challenged by having a multiple dense walls that severely weakens the WiFi signal if it needs to go through more than 1 wall. Because of that I mostly live on the 2.4 signal for all my devices. I worked out some issues when I first moved in so that for the most part I’ve dealt with speakers dropping from the system rarely. Not surprisingly the speaker I’ve had the most trouble with is a Play 1 that lives the furthest from the router with the signal needing to go through 3 walls to reach the speaker. For the most part it’s worked well enough that I havent felt the need to change something for the last 2 years of living here. Since adding a baby monitor to the room, there’s been a noticeable increase in songs struggling to play, skipping or stopping playing, to the point that I purchased a Boost to see if that would solve my problems. Since setting it up, it’s gotten worse with songs stopping play suddenly and constantly. I’ve done a sequential reboot but still struggling with constant song stops. Prior to the boost, songs would struggle to play and skip so I thought that it was the speaker dealing with the weak WiFi signal. With the boost though, songs stop playing suddenly. No skipping. It just stops playing. I can immediately go into the app and start playing again on demand, no problem. But then will continue to stop playing throughout the playlist. I’ve moved channels around a bit but that hasn’t seemed to solve for anything. Any ideas? Thanks in advance for your help!