A network hub will work if you have bandwidth or use a network switch. See https://eastmanreference.com/the-difference-between-an-ethernet-splitter-a-switch-and-a-hub for more info. If the room...

@Dietmar Have you tried a reset to factory? I know that is not fun as you need to re-enter all of the router settings but it may help you in this case.

If it were me, I would do the return.

I have held off on going to Catalina because of this and other apps that do not support 64-bit. I used the go64.app to see all the things that may not work. Things like Quicken, Beyond Compare, Word...

Lets say that one of your other devices is causing an issue with the WIFI. By changing the SSID, it will not connect as only devices that use the new SSID will connect. If you connect your iPad using...

@pkz78 I am assuming durring this time the wired connections still perform at the rated speeds. Next I would try changing the 5GHz SSID and password and connect only one device at a time and test to...