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Having an issue where about 10 - 20 wireless clients are not getting an IP from DHCP.. they are self assigning a 169 address. its only wireless. DHCP pool is plenty big. firewall is a TZ400..
I think your issue is related to a firmware problem on your Unifi APs:
Problem firmware: https://community.ui.com/releases/UAP-Firmware-4-3-24-11355/36d1d2c3-dc75-4f5d-88d9-fb8dda5169ab
Solutions: Use this new RC firmware: https://community.ui.com/releases/UAP-Firmware-4-3-25-11356/f4a8ed99-f33e-444d-a969-23a83ac461c3
or roll back to: https://community.ui.com/releases/UAP-USW-Firmware-4-3-21-11325/88589d81-d149-4163-81dc-a099a5c52ca1
More info: https://community.ui.com/questions/DHCP-Timeout-problems/b7423dea-713e-4f47-92b4-ec754438520f?page=1
Are you using the built-in wireless module of the firewall or a different access point? Are those SonicPoints/SonicWAVEs or some other access points?
Are there any VLANs associated with the SSID?
Technical Support Advisor, Premier Services