My Blaze had already shut itself down yesterday before I took it off to charge it. I reset it and it restarted and ran long enough to show me the battery icon with a narrow red stripe at the left. However, before I could get it into the charging dock, it shut down again and was displaying the Fitbit logo. Tried several times to reset and replace into the charging dock quicker, but I was never quick enough. I left it in the dock overnight and it did not charge. Same story this morning, I can take it out of the charge dock, put it into the wrist strap, and reset it, see the large battery icon displayed briefly, but before I can get it back into the charging dock, it has reverted to the Fitbit icon display and doesn't charge.
