very interesting. Those screenshots show that your internet connection is working perfectly so you haven't got anything to worry about in that regard. All your ports on the switch are gigabit ports so the fact that it is saying stuff is running at less than 100mbits means something is wrong and there is probably no communication at all. Even if you weren't actively using any of the devices the leds on the switch would still be flickering because the switch and the devices talk to each other constantly. Out of interest, have you changed any settings in the router part of the shub over the last week and also configured that new setting on the new shub3? I don't think the shub/switch is at fault because getting a new shub would have fixed the problem and it hasn't.
I don't want to ask you to do a factory reset of the shub just yet because I know what an inconvenience it is to set your ssid's and passwords and stuff up again although it may be necessary to get it out of its bricked status.
Can you turn everything off (shub and pc), disconnect all connected wired devices from the shub including Amazon box and whatever else and only connect 1 pc. Turn the shub on first and give it a few minutes to establish its connection to VM and boot up and then turn your pc on let it get a new ip address from the shub.
When you have done this:
a) does the pc have internet access?
b) what does the network icon on the taskbar indicate
c) do you get the same error message in the shub diagnostics
We need to do this for troubleshooting and go through a process of elimination because something is causing the switch to lockup and I have a funny feeling it could be something to do with the Amazon box. I can remember this happening with the shub1 when you had games consoles and stuff hammering it but this is the first time I have heard of it happening with shub3.
If that doesn't work can you go into the shub's gui and put it into mode mode. When you do this the pc will need to be connected to port 1 on the shub1 because port 1 is the only port which will work and for all intents and purposes the shub will be a modem and not a router which means you will lose your wifi temporarily and the other ports on the switch until you turn it back. When you put it in modem mode the shub will reboot and it may be wise to restart your pc as well because if it works your pc will get a proper new wan ip address. You will need to access the shub's gui on
http://192.168.100.1 to turn it back to router mode but if you still experience no connectivity you will have to do a factory reset to get it back into router mode and the wifi up and running again.
I am not au fait with the shub's gui because I have only ever used it in modem mode in conjunction with my own router so without mentioning tabs and buttons can you tell me what settings you configured when you set it up such as dhcp, ip address range, any access control list or firewall settings etc. Basically anything you changed from the default.