Arc Ultra Surrounds Disconnect Daily After Extended TV Off Period

First, stop factory resetting. This erases any error logs that Sonos might use to help you. 

In response to your questions:

The surrounds are supposed to maintain the connection to your soundbar. The fact that they’re disconnecting suggests an issue with your soundbar, your surrounds or your router…we don’t know which yet.

I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

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.

​@Airgetlam 

Thanks for the response. I have contacted Sonos support multiple times and submitted diagnostics during the issue. The last recommendation was to factory reset the Arc Ultra.

At this point, I was hoping to find someone who has experienced a similar issue and found a resolution.

I did come across a similar thread where the outcome involved adding a Sonos Boost:
https://en.community.sonos.com/speakers-229128/one-sl-does-not-reconnect-when-tv-turned-back-on-6888358?tid=6888358&fid=229128

Ah, there was no mention about the reset being suggested by Sonos.

As I’ve not experienced this on either of my home theater setups, I’ll leave you be, in the hopes you can find a resolution. 

As an offhand bet, I would suspect this has to do with a setting on your router, given that they’re ASUS, some of which appear on the problematic list…but others here use them without any issues at all.

The BOOST is old, and retired technology. It still works with some equipment that recognize a SonosNet connection, but I don’t believe the Arc Ultra has the electronics to recognize the signal.

Good luck!

​@Airgetlam Thanks. I’ve seen some mentions of ASUS-related issues as well, though most seemed tied to guest networks, which I don’t have enabled.

Out of curiosity, what router are you using for your setup?

Oddly, I’m one of those ‘troubled’ types that uses a bog standard T-Mobile 5G device that has a built in router. I don’t have access to things that T-Mobile seems to think are troublesome, such as IP reservations…but the thing works, and I do have a fairly extensive network of Sonos devices, including two home theater setups. I keep wanting to switch to my own router, but haven’t figured out which one, and given it all just works right now (and given the frequent power outages where I live), I’m not overly anxious to change things. 

That really sounds like your router doing something odd, not your Sonos.

I can power my Arc down and not get the blinking white surrounds.

https://support.sonos.com/en-us/article/sonos-led-lights

​@Airgetlam  Yes, I would not mess with what’s not broken.

​@Stanley_4  The surrounds don’t start blinking white immediately, only after an extended period of time.

I came across this Reddit post regarding ASUS DHCP issues with Sonos: https://www.reddit.com/r/sonos/comments/1ow28ko/psa_asus_dhcp_issues/

I’m wondering if the blinking begins around the DHCP lease renewal window (currently 24 hours). I increased the lease time to 48 hours and will report back after testing.

Not my Arc, but on my Beam I often end up with it powered down for days while the surrounds are powered up. No issues.

If you want to look for something Sonos is doing wrong you may spend a lot of time on that as this doesn't seem to be a common issue. 

That the surrounds are not connecting directly to your router when the 5 gHz Sonosnet from the Arc is powered down really sounds like a router issue. At least give the router logs a good look and see what it is doing with the Sonos connections.

ARC will maintain a private 5GHz connection with its surrounds. If the router assumes that these channels are not in use and assigns something else to these channels there will be trouble. Changing the lease renewal times is one step in exploring this issue. On a home network I don’t expect any issues with weekly renewals. 

​@Stanley_4 The Arc Ultra and other newer Sonos speakers don’t use the 2.4GHz SonosNet. That may explain the difference in behavior. https://en.community.sonos.com/advanced-setups-229133/sonsonet-hack-for-new-devices-era-arc-ultra-6928122

It still could be router-related. I’m currently testing whether DHCP lease timing plays a role. Hoping that helps narrow it down to something more specific.