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My home network used to suffer from this after power outages. Turns out a NAS devices was always trying to hand out DHCP IPs and DNS servers (rather incorrectly) rather than let the router do this. That meant if the NAS rebooted before the Router - several devices could have got weird looking IP and DNS settings - like 169.4.0.1 instead of 192.168.0.XXX
The NAS was switched to never give out DHCP addresses - but it still tried to, so when it failed I upgraded it to a full micro media server.
The lesson to pick up here was to sit on a failed machine and click network health / diagnostic tab and look for the details. If your obs PC can see the network, but not the internet - to an DOS ipconfig /all command and see if its settings are correct. If a reboot fixes these things - then another IP config /all command should reveal what parameters have changed.
It is a simple thing to try testing leads are firmly plugged in - and whether changing the switch port they are assigned changes things or not.
Hope these thoughts help!
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