Galaxy M31 monstrous battery is of no use drains almost in 12 hrs, bluetooth connectivity with earphone fluctuates if u keep mobile in ur pocket, there is also network prblm M31 struggles to differentiate between 2g and 4g most of the time it catches 2g while in my same room exactly at same location realme C2 a low budget phone continuously catches 4g. #SamsungR&Dteam should look into this and release a new update to counter all this problems
you can do this.....after formatting phone or if you using your device from long times,so go to device care option and then select battery and then you seeing list of apps, then you can do this which is in screenshots...
add apps in sleeping apps which is not used mostly and use sometimes and disable app which is not usable.
this tips worked please do it and share your experience. ☺️