Why am I still getting broadcast storms?

Userlevel 2
Hi. I've got six Play:1 units in five rooms at my home. I'm in a downtown high-rise condo w/ very thick wi-fi resistant walls so I've had to wire two units to my Ubiquiti Unifi SW-8 managed switch. The setup is generally stable but I still get broadcast storms around once/twice a month. Please see attachments for more details.
What else can I do to improve stability? I've got an unused bridge (old version) though I can't imagine how it would help.

This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.