RT-AC88U - 2.4Ghz - DHCP failures

I’m having issues running a second SSID to separate the 2.4 from 5Ghz. I get about 3 devices hooked up to the 2.4 SSID and then get DHCP failures — IP assignment is 169.254.x.x while the 5Ghz SSID adds more and more without issue.

I’ve run the 2.4 with WPS and WPA2 — no difference noted

Firmware is current 3.0.0.4....

I’ve pulled the power and let it sit for a couple minutes as well as cycled power on the devices which have had the DHCP failures...includes an iPad with iOS 11.

Any...

RT-AC88U - 2.4Ghz - DHCP failures