Probably WiFi issues, what router, or Wifi mesh system is it? Any access points, WiFi repeaters etc? Are you running the devices on SonosNet (with at least one Sonos device wired to the router) or entirely on your WiFi (No devices wired) ?

Thanks for your quick response. I meant to note that Spotify connect used to run flawlessly with my router. Then that got spotty so I started using the sonos app and that worked for a bit… now everything is spotty. Router never changed during that. 
 

I use an eero router. Only one, it’s not a full mesh network or anything. I use a play bar and a sub – I am entirely on WiFi (no sonos devices connected directly to router)

Okay there is a likelihood that your Eero router perhaps changes its 2.4ghz and 5ghz WiFi channels on updates and reboots etc. So i would suggest changing and fixing its channel on either 1, 6, or 11 for the 2.4ghz WiFi band, which Sonos uses. These are channels that do not overlap other channels. Perhaps start with channel 1 to begin with and see if that fixes things for you or then try the others, but give them 20 minutes, or so, to fully settle after changing things. 

It’s also worth reading and heeding the advice in this link:

WiFi Interference

Hope that assists.