Do you have coax anywhere near where your Hubitat hub is? If yes, you can try MoCA adapters to get ethernet to your hub. Even simple ethernet over power adapters should work.
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At our old house my hubs were connected to a dumb switch which was in turn connected to my internet router via powerline adaptors. Hubs upstairs, router downstairs.
This worked just fine with no issues.
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I don't have time to test this in Hubitat, but I have experienced where security cameras would refuse to connect to a Wi-Fi network. It took a while to diagnose, but it turned out to be because the SSID was 2 words, with a space between them. Every other device on the network connected fine, but not these cameras. Does your SSID have any spaces, or other special characters.
I would also eliminate the WPA encryption as being the cause, by temporarily disabling it on the router.
You could also try connecting to another device, for example your phone's Hotspot, to determine if the connection problem is isolated to only your router.
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The reason not to allow both ethernet and wifi connections (multiple paths to the same vlan) is to prevent broadcast storms. Spanning tree could take care of that while providing path redundancy were it implemented. Here it has to be one or the other. Choose ethernet if you can make it happen. The weirdness switching back and forth could be associated with the layer two forwarding tables containing obsolete forwarding information which will age out in a few minutes on their own. Usually disconnecting the ethernet cable from a port is enough to remove the client mac address from the port so I don't know why they care about downing the port first.
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My thoughts on wifi problems has to do with IOT devices not having robust wireless protocol stacks. If your wireless router tries to get to fancy with settings outside of the most standard and basic they get confused. The other is home wireless routers trying to be helpful and getting in the way. One of the reasons users have problems using the same ssid on both 2.4ghz and 5ghz. Dual band clients have no problem with it from an ssid standpoint. But home router default configurations prevent discovery between the two ssids preventing connections from occurring.
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