This is happening across all devices and browsers, across Wifi and LAN connections direct to the Hub 3.0. I have the hub plugged into Google Wifi (however the issue is still there on LAN connections to the hub and on the Hub default Wifi so I dont think it's Google Wifi)
I have been on to tech support, they sent out a new hub, but I still have the same issue.
So far I've tried
Unplugging and reconnecting all the wires
Only using LAN
Flushing local cache and DNS on devices
Disabling firewall on router
All to no avail.
Some strange observations
Speed is still super fast - 480MB down, 49MB up
Zoom calls haven'y cut out once, or Facetime
Netflix, Nest cam and phone apps are all playing up. Sometimes wont connect at all, sometimes need refreshing.