Hi there. I have a fairly big network for a house. its 3 houses in the same lot.

Setup

Gateway : ER 7206

Switches: SG2210MP v4.2

                TL- SG2210P v3.2

                SG2210P v5.2

EAP:  3 x EAP 115

          3 x EAP 225

          2 x EAP 225 Outdoor

          3 x EAP 245

VLANS: 10 VLANs

WLANS: 13 WLANs

Wireless Clients: 122

Wired Client: 29

The problem a i have is. My VLAN for IoT 2.4Ghz, sometimes loose connection to the internet. but only sometimes. when i connect my phone to that vlan works fine for a while but sometimes my phone says "no internet connection" and come and goes. one time i was having problem and i solved adding the DNS 8.8.8.8 the VLAN - Lan network.

Screen of Wireless SSID

VLAN Lan

I cant figure it out what seems to be the problem.