I would suggest you do the hard reset from the boot menu! before that do take your data backup in cloud and as well as on pc, sync your settings and etc.. in Samsung ☁️ and don't forget to remove your primary Google account before you reset your phone.
Be assured below given steps would help you out to solve the issue which you are facing :-
1) Perform Battery Optimization:- Settings > Select Device Maintenance/Device Care > Optimize > Optimize all options like Battery, Storage and Memory, 2) If issue has not been resolved then turn off Bluetooth, Wi-Fi, mobile hotspot, NFC etc, 3) Kindly check whether mobile network fluctuates frequently or network signal is low in your area. In both cases battery will drain considerably fast. 4) Kindly set the device display brightness in auto mode (If available). 5) Screen timeout settings:- Settings > Display > Screen timeout > Select minimum screen timeout
If issue still persists kindly send us the error log file within 15 minutes of issue occurrence. Steps: Samsung member > get help > Error reports > Select Symptom > describe problem > Send.
