Your router is failing to pass the SSDP data used to discover/track devices to your phone, most commonly because your Era is on a different wifi frequency to your phone.

Your Era is still on your network (which is why it still can play things and reach out to the cloud for voice control), but the local network connection to your phone specifically is broken.

To verify, change your wifi to be 2.4GHz only, to fix properly either fix the router configuration, or get a better router.

Thanks for the reply. I have a Ubiquiti Unifi network, the USG being my gateway. If this is the case, I wonder why it just started happening after nearly a year of normal operation, I’ve not made any changes to the network config. I’ll dig into the config and see what I can find. The weird thing is that the speaker does temporarily reappear after a power cycle.

Also odd is that my Arc, Beam, subs, Amp and Ones aren’t having this issue. Does the Era connect differently than the other products?

After a power cycle, devices likely start on 2.4GHz, then after a bit realize 5GHz is better then switch.

The Arc and Beam, maybe others, can only connect to 2.4GHz, so wont hit this problem.

The fact is only started recently may be due to a firmware update in something, or a new neighbor blasting over your 2.4GHz frequencies which forces your phone to jump to 5GHz, for example. Unless you live off the grid, something is always changing, though not in obvious ways.

Ubiquity gear requires careful configuration to work correctly with Sonos, I hope you have followed the recommendations on the github doc and/or the Uni site for this.