Yesterday I was logged out of my account and when I tried to log in it said my credentials weren't valid, as if someone had changed my password. I went ahead and created a new password for which I received a mail. After that I could log in with no problems.
This morning I was logged out once again and my new credentials weren't valid, but I haven't received any mails regarding another password change.
If this continues to happen I'll have to move to another cloud service as I can't access my documents.