Clients using Iphones are always disconnected from the network and are constantly asked to login

[sebastiao_paulo]

Hi guys

I'm using captive portal from my Firewall to my users to login for internet.

and I have ZD 1200 with 30 APS

Clients using Iphones are always disconnected from the network and are constantly asked to re-sign 

but client with Android are not getting these issues only IOS phones.