safari glitchy contstantly reloads
frequently getting "problem loading page" error
Question marked as
Which macOS version?
If you do not have a current and complete backup, first go get a current and complete backup. This on the off chance you’re encountering a hardware problem or corruption.
Boot into Safe Mode, and try your tests again. Safe Mode disables various extensions which can be sources of problems, a d rebuilds caches.
How to use safe mode on your Mac - Apple Support
Remove any add-on ad-blockers, add-on VPN clients, add-on anti-malware apps, add-on anti-virus apps, or add-on cleaner apps, and try your tests again.
If there’s a web proxy configured, and you didn’t add it or don’t need it, remove it.