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27th May 2026 - 📲 New Sonos App Update Now Available! 🔊

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  • May 27, 2026
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Sharing in case anyone else is hitting the same wall.

Setup: 18-unit all wifi system, ASUS RT-BE86U on Asuswrt-Merlin with two AiMesh nodes over Ethernet backhaul. Two problem rooms — a Symfonisk Gen 2 pair + Sub Mini, and a Sonos One Gen 2 pair + Sub Mini — both associated to the main router. A separate HT setup and an Era 100 pair + Sub Gen 3 on a node worked perfectly throughout, on the same network.

Symptom: each problem pair was flaky on its own with a ~15-second startup sync hiccup at stream start. Grouping the two rooms together was completely unusable — never settled, total dropout chaos. Bitrate-independent: 128k MP3 from the library dropped just like lossless.  Removing subs improved the syncing significantly.

What I tried, none of which moved the needle:

  • 2.4 channel fixed at 1, 6, then 11
  • IGMP snooping enabled, then disabled
  • Roaming Assistant, Airtime Fairness, Universal Beamforming all off
  • DHCP reservations for all Sonos units
  • Submitted a diagnostic to Sonos support — they gave up after 45 minutes and never followed up

Today's app update landed with the global SonosNet disable toggle. Flipped it on. No other changes anywhere in the system or router. The pairs now settle within a second when grouped and play cleanly. From unusable to fully functional with that one toggle.

My guess at the mechanism: older S2 units (One Gen 2, Symfonisk Gen 2) keep SonosNet coordination code active even without a wired anchor unit in the system, and that legacy path was the source of the instability for bonded trios under group conditions. The Era line has no SonosNet capability at all, which would explain why the Era pair + Sub Gen 3 worked perfectly throughout — different code path entirely. Same silicon class, different software path, completely different result.