It may be due to DNS issues, browser settings, network configurations, or even the firewall/antivirus software on your main PC. Since other devices on the same network aren't affected, it suggests the problem is localized to your main PC.
Open Command Prompt as an Administrator and run the following commands:
ipconfig /flushdns
ipconfig /release
ipconfig /renew
Additionally, you can try using Google's DNS or Cloudflare's DNS:
Google DNS: 8.8.8.8 and 8.8.4.4
Cloudflare DNS: 1.1.1.1 and 1.0.0.1
Reset Network Settings.
Reset the Router.