I have a nearly two year old system with 9 SONOS players wired directly to ports on a 48 port Ubiquiti EdgeMax switch. The Network also supports 4x Ubiquiti Access points [3x AP-Pros and 1x Outdoor], a bunch of wired Apple TV's, Blu-rays, PS4's, etc. and DirecTV Genie. The system worked well for more than a year but has [apparently] now developed debilitating broadcast storm problems. Nothing changed from the initial system commissioning, aside from SONOS updates, whatever changes AT&T may have made to their modem/router hardware and a modem swap by AT$T several months ago which did not initially cause any notable instability.

Eventually, the network became unstable and unreliable, though a router reboot usually cleared the problems. We inevitably concluded that the AT&T DSL Modem/Router was the likely culprit since the particular model Arris AT&T deployed 8 months ago as a replacement for the original ended up listed on SONOS' known incompatibility list. As such, the client ditched AT$T and we switched to a Ubiquiti EdgeRouter Lite and Arris SB6190 modem yesterday morning.

The network tested and functioned perfectly for the 5 hours we were onsite...Time Warner levels and line conditions were perfect, SONOS Diagnostics were confirmed by SONOS to show happiness by all devices.

At 11 pm the network went down and began displaying no internet access. It's still on and off this morning. TWC reports no problems with the modem...

When speaking with SONOS tech support yesterday, the agent initially expressed concern that the Ubiquiti Switch was listed as Root Bridge for STP. He checked with someone else higher up the chain who said this was not a problem on Ubiquiti switches and as long as either the switch or a SONOS player was root bridge, STP would work, though there was concern that at some point in the future after a reboot, a WAP or DirecTV node could takeover as root bridge, thereby causing storm or other performance problems.

SONOS also re-confirmed that their product does work with Ubiquiti managed switches, when properly configured. Unfortunately, they can only provide switch setup specifics for Cisco managed switches, which do not comport with Ubiquiti.

Has anyone experienced these issues with SONOS/Ubiquiti combos? Can anyone share specific STP setup information for an EdgeMax switch that is known good with multiple wired SONOS units? Does anyone know how to force a particular device as root bridge on an STP-enabled network? So far, none of the networking experts I've spoken to can answer the question.

TIA