I’m having this issue now, and this is a replacement that I received in May or June. I don’t think my Fitbit is under warranty anymore, but let me tell you, this was my 2nd replacement since buying the Charge3 in July 2019. The first one stopped syncing in November. Fitbit replaced it. That replacement lasted until May or June, and it started getting lines. More and more lines each day, and then it just died. The screen stayed blank. Fitbit replaced that one. And now here I am, just a few months later, and the same issue as the last seems to be happening. I wondered if maybe my charger was culprit, since I’ve had it for all 3 of these trackers. Or maybe it’s a really common problem?! It’s really hard to believe that I would get 3 lemons. My charge2 lasted 2 years. No problems other than a cracked screen! It was still technically working when I traded it in for the charge3. But after these issues with charge3, I’ve determined that if I’m outside the warranty window, I’m going to try a different brand tracker.
