HTZ Rezound here. I had the same issue as everybody here. I disabled sync for all of my Google services and rebooted, then turned them on one by one. I purposely saved Google+ for last, and actually left it off for one day. After a day and a half of no issues, I decided to enable Google+ sync again. Right away I got the sign-in error. So it appears to be related to Google+, at least it is for me. And even with Google+ sync off, the Google+ app works fine. So I'm just going to leave it off. In fact, most of the services seem to work even with the sync off (except Gmail). If I turn off calendar sync, it still appears in my calendar. If I turn off Drive sync, I can still see my Drive.