Can't predict the exact cause but there are two possibilities one is that the health of the battery is seriously bad ..for that you've to reach the service center and get that checked or it may be a software issue which might get fixed with any future updates. And there's one more case in case you've downloaded any suspicious app (without knowing) it may be sucking battery overnight. If you've any of the cleaners,or games that you see ads of on instagram or an app with lots and lots of ads in it try to uninstall them and in the settings menu check whether any app that you don't want is using background processes. Hope it helps🤜🏻🤛🏻
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question). Kindly send us the screenshot (which apps are consuming most of the battery). Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
