Try explicitly setting your DNS servers to either cloudflare (1.1.1.1 and 1.0.0.1) or google (8.8.8.8 and 8.8.4.4) and see if that has any effect.

If that does not help, make sure you’re getting a good signal from your router. Move your PC and router closer together for testing purposes to rule out wifi interference.

Troubleshooting issues like that are often a matter of ruling things out as best you can to track down the cause.

If it ain’t broke…