Win + R > ncpa.cpl > choose your network > properties > IPv4 > properties

1. if checked on > Obtain DNS server address automatically

   Try this > Prefered DNS server (8.8.8.8) & Alternative DNS server (8.8.0.0)

2. if checked on > Use the following DNS server address

   Try this > Check on > Obtain DNS server address automatically

Check of your proxies.

Check of VPN.

Check of browser extentions > Try to disable them.