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Firmware Version :

ISP :

Background: I have a new C3150 v1, using Smart Connect to use only one SSID and let the router chooses which client uses which band. I have a few IP cameras and smart outlets (different brands) that can be controlled via WiFi, and they can only use the 2.4GHz. I have some smartphones and tablets that can use the 5GHz as well as 2.4GHz.

Issue: I find that I cannot access or see these 2.4GHz devices at all from my smartphones that happen to be using the 5GHz band. If I force the same smartphone to connect to the 2.4GHz radio (by moving farther away from the router), it immediately can see and control the 2.4GHz cameras and smart outlets fine.

So I've come to the conclusion that somehow the 2.4GHz and 5GHz clients are isolated, by mistake of the firmware/routing. Any ideas?

Additional parameters:
Smart Connect is ON
AP Isolation is OFF on both bands
Airtime Fairness is OFF on both bands
MU-MIMO is OFF
Guest network in ON, only enabled on the 2.4GHz radio