Thank you @d0ugmac! I'll try what you suggest, but I'm pretty sure that's not the problem (ping stops responding every time the OC300 reboots). The DHCP server is a pfSense. I can configure a static...

I buy an Omada OC300 and two EAP610-Outdoor. On first login, a few weeks ago, I connect the two APs to the controller. Today I logged into the controller to set a static IP and change the default...