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The Ninth
The Ninth
Collaborator I
April 25, 2026

Sonos Amp becomes unreachable on UniFi after some time (no ping / no ARP, link still up)

  • April 25, 2026
  • 22 replies
  • 561 views

Hi everyone,

I’m running into a recurring issue with my Sonos Amp in a UniFi network and wanted to check if anyone has seen something similar or has a working setup with current UniFi firmware.

Setup:

  • Sonos Amp

  • Ubiquiti UniFi network system (UDM Pro + switches)

  • Amp connected via Ethernet (also tested via WiFi)

  • Flat network during testing (no VLAN separation)

Problem:
After a reboot, the Amp works fine. But after some time (hours to days, even when idle), it becomes completely unreachable:

  • disappears from the Sonos app

  • cannot be pinged

  • does not respond to ARP requests

In UniFi, the behavior varies slightly:

  • sometimes the device is still shown as connected but greyed out

  • other times it disappears entirely as a client

  • however, the physical link LED on the switch port remains on

Only a full power cycle brings it back. Replugging Ethernet alone does not help.

What I already tried:

  • Ethernet and WiFi (same behavior on both)

  • Disabled WiFi when wired

  • IGMP Snooping + Querier enabled

  • RSTP enabled, STP Edge on the ports

  • Forced 100 Mbps Full Duplex

  • Disabled PoE on the port

  • Tested different cables and switch ports

  • Monitoring via ping (device stops responding entirely when the issue occurs)

From what I can tell, when the issue happens the Amp stops responding at a very low level (no ARP replies), even though the physical link remains up.

Background:
Interestingly, I had a very similar issue about two years ago. Back then I was able to resolve it by adjusting some UniFi settings (related to multicast / network behavior).

However, after various UniFi updates, those settings either changed or are no longer available in the UI, and I haven’t been able to reproduce the old working configuration.

Question:
Is anyone currently running a stable setup with the Sonos Amp on UniFi?

  • Are there any specific UniFi settings (current firmware/UI) that are known to fix this?

  • Has something changed in how Sonos interacts with UniFi?

  • Or does this sound like a faulty device after all?

Would really appreciate any insights or current best practices for Sonos + UniFi.

Thanks a lot!

Robert

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22 replies

Show previous replies
80z_music
Lyricist I
June 3, 2026

I am experiencing the exact same issue except it’s happening with more than just the amp.  This all started happening for me after the latest Sonos update.   No arp, no ping, active link, only a reboot fixes the issue.  It happens every few hours like you mentioned.  
 

I confirmed via command line on my switches that everything is setup as expected from the networking side and when the devices are rebooted they communicate properly.  But after sometime when the Sonos system is idle the network interface on several of my Sonos gear gets locked up.  
 

I truly think it’s a firmware issue.  
 

 

Airgetlam
Airgetlam
June 3, 2026

If so, you’ll be best off if you call Sonos Support to discuss it, and speak with a human. 

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Bruce
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