Sense 2 battery keeps draining during the night

[Deeep]

Since last week, battery on my My sense 2 lasts hardly 24 hours. It used to last 5 days before. I think somethings changed with update recently. I also noticed that the watch remains connected to phone via bluetooth, but doesn't necessarily sync data unless I open the app on phone and perform manual sync. For last three days, I've tried varies combinations, removed spo2 app, disabled bluetooth on phone, factory reset on the sense 2, change watch face, disabled all notifications, disabled all battery hungry features as per fitbit instructions to improve battery life. But no luck, battery behaviour is very inconsistent, it goes down from full to dead within couple of hours some days, and when connecting to charger, it shows 25% remaining !

I can't understand how a perfectly working device can all of sudden be broken with a update and nothing being fixed. Been a fitbit fan over last decade, but this feels completely off, it appears as though google for sure wants to end of devices and force everyone to move to Google's devices. Has anyone else faced similar issues recently after update? I wish there was a way to rollback these updates

Moderator Edit: Clarified subject

[MarreFitbit]

Hi there, @Deeep. Welcome to the Fitbit Community Forums. Thanks for bringing this to my attention and for the troubleshooting steps you've tried. I'm sorry to hear that the battery of your Sense 2 is not lasting as expected. I understand your concern, I will do my best to help you with this!

To better assist you, I suggest reaching out to our Support Team who will be able to take a closer look into this issue and provide further help. This form is only meant for you to use. Click here to get access to it. 

[Deeep]

Thanks @MarreFitbit ,

I tried filling up the support form, i guess it isnt allowing me to submit outside support hours, I will try again during support hours. 

the watch continues going dead on random basis. common observation is, it starts non-stop restart loop on its own, which i think kills the battery. till the battery is dead, or some n number of restart cycles, it does not allow any operations despite being connected to charger. this time it was not late hours, but during day time it did this. I allowed it to die peacefully, then once it stopped the restart loop, i connected that back to charger, and it was up as if nothing had happened. Except the battery percentage went from 0 to 39% in 2 minutes. so I have effectively charged this device twice in single day and it still continues to die on me.

I have already performed most of the recommended steps for preserving or improving battery life. one more important observation is, i see my watch has firmware 214.X where as the latest firmware seems to be 220.21. I do not get any option to update in my fitbit app. the app is up-to-date (with dark theme and all). how do i get the latest update ?