Thank you, I appreciate the support. But this doesn't explain the intermittent nature of the issues. For example, just now I tried to open a word file. I got the error message. But then I tried several times and restarted the app twice, and eventually the file did load. It just took five+ minutes of trying over and over.

I also had to add a new user yesterday, so I went to admin.microsoft.com in Edge. 403 error. Tried Chrome and Firefox. Same. Went back to Edge and suddenly it loaded. The like an idiot I refreshed, 403 error again. Another 5 or six refreshes and it finally loaded again and I was able to add the new user. There's never any real error messages that would help me debug anything, it's just endless frustration and slowness.