Have you looked in your batteries monitoring section to see what is using the juice ?
How long have you owned the phone ?
Have you recently completed a firmware update ?
There are other troubleshooting avenues but the ones above are good to start with.
Daily Driver > Samsung Galaxy s²⁴ Ultra 512Gb ~ Titanium Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help. " This is the way. "