Safari 15.1 - A problem repeatedly occurred with...

Hello Call2o,

Thanks for completing those steps. Next, let's see if the same issue occurs in another user account? If you already have another user account set up, then you can use that one or create a new one to test in using the steps here: Set up users, guests, and groups on Mac

Also,  does the issue occur while in safe mode? If you are not familiar with the safe mode steps, you can follow the steps here: How to use safe mode on your Mac to get it done. Once in safe mode, you'd want to use the Mac as you normally would to see if the issue occurs again. You can tell when the Mac is in safe mode because on the desktop it will show the words Safe Boot in the top right-hand corner of the screen. 

Best regards

Hello Call2o,

We'd love to assist you with resolving your Safari concern. Let's start by completing the steps listed here: If Safari on Mac doesn't open a webpage or isn’t working as expected to resolve the issue. Please make sure to click on the words listed in blue because they will provide additional steps and information.

Take care

The problem is bigger than that. Everything caused by the latest update. See also:

https://discussions.apple.com/thread/253353911

I have a similar problem. All websites work as normal but the more I use Safari 15.1 throughout the day, a growing number of websites fail to load. Quitting and restarting Safari fixes the problem, but not for long. Half of the websites that I go to never are a problem, but many others are. Maybe someone from Apple could tell us what gets flushed or reset whenever Safari is quit and restarted.

Both were already checked.