Wifi and Router work, until I plug etheet from laptop to router

My router and wifi work fine for all devices. However I prefer to use an etheet when I want to play online games with my laptop. When I start the computer with an etheet b/t my laptop and the router, the inteet and wifi drops entirely for all devices and even the laptop w/ the etheet doesn't have inteet. If I restart the router and modem while the laptop is etheet'ed to the router, it says there's an inteet connection, but nothing loads. So then I restart the laptop and the inteet connection drops again. What could cause this?

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