Hey, boater44, I’ve got the exact same problem, and for me, it also seems to have started with the latest update to Catalina that updates Safari to version 15. I am using a 2012 iMac.
There are a couple of my medical providers’ secure websites that I go to regularly and when I try try to access the login page I get “This webpage was reloaded because a problem occurred” and I then get a blank page with a notice in the center that says “A problem repeatedly occurred with …" and it gives me a URL that gives the website and then a “/?.ga." and then a bunch of numbers.
I'm not a big user so I don’t go to a lot of websites but I haven’t found other websites with this problem…yet.
Here’s what I’ve done with no success;
Selected “Empty Caches” in the Develop menu
Deleted the ~/Library/Caches/com.apple.safari folder
Deleted All History
Removed all the websites in Cookies & Website Data of Safari Preferences
Added a second user account and tried accessing the websites with Safari there
Rebooted into Safe mode and used Safari
Moved the ~/Library/Safari folder to the Desktop and tried Safari again
Opened Keychain Access and in Preferences “Reset Default Keychains…”, logged out and back in
Moved the ~Library/Keychains folder to the Desktop, logged out and back in
Booted into Recovery and re-installed Catalina.
iPad and iPhone works fine
Works fine on a friend’s 2014 Mac mini using Catalina 15.7 and Safari version 15.
After doing the Safe boot and re-installing Catalina, I am now convinced it’s a bug in version 15.
I'm a casual user so I don't have any third very apps, except for Firefox, which I just added in order to access those websites. I'd rather use Safari, so a fix to this would really be appreciated.
I’d love to hear someone’s ideas of what else to try.