Sense stopped working properly after 8 months

[Gf91]

I got my Sense almost 8 months ago, and at first, I was so happy with it, everything worked fine.

Now the battery lasts maybe 48hrs (if I am lucky), notifications are not showing up, it stopped tracking my activity accurately and even the sleep tracking is messed up.

Any suggestions?

I tried to reset it, get it to completely finish battery life and recharged it, not sure what else to do...

Could this be an issue because I switched my phone from android to ios?

Moderator Edit: Clarified subject

[Guy_]

Hi @Gf91 - 48 hours is about right if you have Snore detection and SpO2 tracker installed, see more How to resolve the Major issues causing short battery life. 

Syncing could be an issue - make sure to remove the Sense Bluetooth entries from the old phone - also try if turning off Bluetooth [which stops any syncing problems using up battery] and see if that is an issue.