@TazDevilLooney Have you connected your Google Nest Hub to other 2.4G WiFi for testing? Same issue there? If set a separate 2.4G SSID without password for this Google Nest Hub, will make it better？

@Ja2ck7 In some cases, the switch is not a necessary factor for setting VLAN, you can achieve that only with the router, take a look: How to create multi networks and manage network behavior with ACL

@tooner To be honest, the speed could be halved by losses or obstructive interference in large extent as the network is extended over long distances. Unless you can use total wired connection to...

@rama3124 Try changing port 2 PVID to 10, and see what it happens?

@stargazindreamr You said you disabled Fast Roaming to test, did it work? Did you test the cable? What about using short cables?

@yepaingsoe001 It is a good choice to enable Maxtream feature, this function can make the entire connection more stable.