Hello boaster_11,
Thank you for reaching out to Apple Support Communities.
Let's test in a private window to see if the same thing happens:
"Test with a private window
A website can store cookies, caches, and other data on your Mac, and issues with that data can affect your use of the website. To prevent the website from using that data, view it in a private window: From the menu bar in Safari, choose File > New Private Window, or press Shift-Command-N.
If that works, use the following steps to remove the website's data, including its caches and cookies. The website can then create new data as needed. If it's a website that you sign in to, make sure that you know your sign-in information before continuing.
- Choose Safari > Settings (or Preferences), then click Privacy.
- Click Manage Website Data.
- Select the affected website from the list shown.
- Click Remove.
- Click Done.
- Open the website again in a non-private browser window."
Let's also review all of the other recommendations outlined here: If Safari doesn't open a page or work as expected on your Mac
If the issue persists, can you provide a few more details? When did you first notice this? What is your exact macOS version? Also, have you tested on any other networks?
Cheers!