Hang up in "Internet Accounts" in System Preferences.
Is anyone else having issues loading "Internet Accounts" in system preferences? It is extremely slow for me and occasionally totally freezes.
I had exactly the same issues like yours. Even my Messages, Facetime, Web Browser were not responding at some point. Every time they were not responding, I found that the "Internet Account" was empty. Next time I will try kill accountsd.
Will report back.