Charge 3 sleep information inaccurate

[SaltyLiquorice]

Hi, I've had a Fitbit Charge 3 for about a year and a half. My first was replaced a month ago because the band broke. I've (almost) never had problems with sleep tracking with my old device, but the new one has not had one accurate day.

I logs both the bedtime and wake up wrong (it often says I wake up at 4 or 6 in the morning, but in reality I sleep until 9 for example). It also sometimes says I slept way longer than I did (but sometimes this makes sense due to low activity/inactivity in the morning). It differs between saying I slept before and after I actually did.

I know that I can edit the logs (and I do), but I kind of counters the purpose if I have to check when I fall asleep every night and when I wake up every day. Does anyone know how I can fix this problem? And maybe also why it never happened on the old device but always on the new?

Moderator Edit: Clarified subject

[AlejandraFitbit]

It's great to see you around, @SaltyLiquorice.

I understand how are you feeling and appreciate all the efforts in trying to fix this sleep issue. I recommend trying the following:

1. Make sure to not take off your tracker during the night.
2. Do you remember being awake during the night? If yes, that solves it! Keep in mind that your tracker will detect if you are awake and will stop the sleep tracking process. If no, proceed to step three.
3. Restart the tracker. See instructions in the help article: How do I restart my Fitbit device?.
4. Confirm that the tracker is snug on your wrist (with an HR tracker, the lights shouldn't be visible).
5. Try sleeping with the tracker on your non-dominant hand.
6. If the setting was set to sensitive, please switch it to normal. 
7. If steps 1-6 do not solve the issue, I suggest manually editing the sleep log to reflect the time slept. See instructions in the article: How do I edit my sleep history in the Fitbit app?.​

Let me know how it goes.