Hello @user42570 ,
Please perform these connectivity troubleshooting steps to see if they alleviate your issue, especially the cache clear and plugin/extension turn-offs. If you continue to experience issues, please perform an internet speed test, and call in to our general support so they can do a screenshare while the issues are occurring.
Doing these troubleshooting steps above can help us determine what might be the issue. I do apologize that you are having this experience and please let us know if you would like us to continue troubleshooting with you! Thanks.