Same boat here. Bought mine after Christmas 2017. Back at the beginning of August sleep tracking on mine quit working (HR data still appeared to be fine). About a week later HR stopped working. Now sleep tracking doesn't even work at the most basic level. Makes me wonder if steps are even accurate at this point.
I have factory reset the watch at least 5 times to no avail. Even chatted with tech support to see if there were any unlisted steps/known issues as there seem to be quite a few people with the same problem. Spent an hour being walked through the same exact steps with the same end result.
The only odd thing I noticed is that via the API the watch sends minute lvl HR data (looks accurate to me) in 7-9 minute interval batches. No rhyme or reason in the timing (once per day, a few times per day, or hours apart), but almost spot on lengths of time. Fwiw I let the chat support person know, and documented my problem(s) 🤷:male_sign:.
At the end of the day, I currently have a very expensive electronic clock & notification device on my wrist, lol. I expected a minimum of 2.5 years of use out of something this expensive. My wife's apple watch purchased 6 months prior to my ionic is still going strong. Holding out a sliver of hope this update fixes it, but not holding my breath. I like Fitbit. I just don't have faith nor the cash to burn $300+ every ~18 months on a device. I do know one thing though, my personal money will sure speak louder than the words in this post when I spend $2-400 on my non Fitbit replacement watch in the next couple of months.
