My kitchen Sonos One SL which worked for 4 years mostly without issue, has just started losing connection to wifi while the other half of the stereo pair (another Sonos One SL) continues to play. Swapping places, changing rooms, even wired over LAN, the problem continues. At times it breaks the app and the entire room they’re in completely drops from the app. Sonos team on X (Twitter) are gracious, even DM me at all hours, but some of the call center techs are argumentative and give me bad troubleshooting advice about this issue. BTW I also have a Sonos Ultimate immersive Set (Arc+Sub3+dual Era 300s) that play without issue on the same WiFi. Any suggestions will be greatly appreciated and welcomed.
Thank you.
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Have you updated the SONOS system along the way? Memory allocations are dynamic and you may have an intermittent block. If the block is in use today and it’s feeling bad, you’ll have issues.
Also, I have that Verizon gateway in two separate locations, one without any SONOS installed. I’ve developed the habit of rebooting the Gateway’s once a month — otherwise things start to become weird.
Thank you for the reminder. I bounced the router, changed the SonosNet channel, then updated the network settings for both SonosOneSLs individually. So far so good, both network connection and stereo pairing are stable Appreciate the feedback 
Make sure that you reserve IP addresses for all of your regular network clients.
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