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@TheShipwright
@dicki did your visitors tinker with the router setup?
If not I imagine the DHCP address assigned to your PC (previously) was assigned to your guest and when your PC tried to use it to access the web it caused an issue. By releasing/renewing you've reestablished it's yours.
Did you try restarting your PC that should have done the same thing.
If it comes back bounce your router I guess.