Thanks for the help, much appreciated.
I finally got to the bottom of the problem, to summarise:
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It appears there was some sort of problem (dip) with the power during the night, not enough to knock everything out but enough to reset the C8 and my router, so I didn't know about it, (email msgs went down) but everything else was working and I hadn't touched the C8 for 3 or 4 days.
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The C8 rebooted with the internet still down, SO, it switched to WiFi.
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When the C8 goes to WiFi it does NOT go back to ethernet, even if i reset the interface with the little button (lots of times).
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The C8 was on its own WiFi network setting that doesn't seem to broadcast its name/ssid etc.
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To add to my problem my M2 laptop is happy to load and run the Hubitat app, but it doen't work, it gets stuck looking for a hub with no way of getting out of that page.
Thanks Heaps,
Richard.....