pc with main and secondary ip: why is changing between bth ips in IqCloud?

[EduardoG]

Hello

 In the Extreme Cloud Iq:

We have a pc connected via interfaz wifi: with a principal ip fixed manually 172.26.0.20 and one secondary ip 192.168.10.239

Sometimes there are short cut in the network services in the pc,it may be 90 second of cutting the Service, and it back sto work.

Sometimes in wifi controller we watched the pc witch 172.26.0.20 and some minutes later is appearing 192.168.10.239.
 

How to solve it?

Thank you

[EduardoG]

We are using a external (out of the wifi networkd) dhcp server:
The firewall (fortigate) is the dhcp server in the different vlans of the wifi network.

[SamPirok]

Are you using an AP hosted in ExtremeCloud IQ as your DHCP server, or do you have a DHCP server set up on your backend network?