How long does the Battery last? Whilst can be a bit of a hassle sometimes necessary to do a Factory Reset after backing up , may best to restore from cloud and set up some things manually.
However if the drain is still significant advisable to send an Error Report. Go To Samsung Members -Get help -Error report. include the error logs plus details of the issues , and screenshots of the battery usage (Settings -Battery and device care - Battery).
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.