Had 52 consecutive days count/Fanatic badge suddenly down to zero. I logged in continuously and I stayed aware of the UTC timing and didn't just go to the home page.
This is the second occurrence of such behavior. It was reported by other users as well.
Below screenshots show visit action consecutively for 59 days (7 Jul - 4 Sep) with action range of(login/answer/vote/question). Now the count shown 4 but account's "visited x days" shows 59.