Asus RT-AC88U - Devices cannot talk to each other

Hi All,

I have a weird problem with my router and I guess I need to tweak some settings.
I am running both 2.4 GHz and 5 GHz wireless networks on my router - sometimes devices connected via WiFi cannot talk to each other.

Example: When my Apple TV 4K and my iPhone are both connected to 2.4 GHz, the remote app cannot find the Apple TV on the network. But when both Apple TV and iPhone are on 5GHz, they are able to see each other.

I had similar issues when setting up Google Home Hub. It...

Asus RT-AC88U - Devices cannot talk to each other