Hello and Welcome to TSF!
Are you still using the same Modem? Perhaps a Power Cycle is needed. If it didn't help please update us.
1. Save all your current work, close all open applications, then shut down your computer. Wait for a minute.
2. First, turn your Router off and wait for a couple of minutes.
3. Turn off your modem.
4. Disconnect all the ethernet cables that are connected to the router and modem and the PC.
5. Reconnect them and ensure that there are no loose connections in between them.
6. Now, switch on your PC and let it boot.
7. Switch on the modem first and after it gets initialized, switch on the router.
Are you still using the same Modem? Perhaps a Power Cycle is needed. If it didn't help please update us.
1. Save all your current work, close all open applications, then shut down your computer. Wait for a minute.
2. First, turn your Router off and wait for a couple of minutes.
3. Turn off your modem.
4. Disconnect all the ethernet cables that are connected to the router and modem and the PC.
5. Reconnect them and ensure that there are no loose connections in between them.
6. Now, switch on your PC and let it boot.
7. Switch on the modem first and after it gets initialized, switch on the router.