It keeps disabling my Ethernet port
0 is highest priority, so make the Ethernet port 0.
Note, this might not be your problem, but it would be my first guess.
I do need Wi-Fi - it’s how I’m connecting to the internet. Ethernet in this case is solely for a LAN not connected to the wider International Network.
Maybe it’s a DNS server or NTP server outside that it is trying to reach?
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I expect so – I expect that if Plasma detects that any network hardware is able to reach the OS-designated NTP server, that any hardware unable to do so is defective. This assumption is incorrect.