iPhone battery draining overnight.
My iPhone XS has drained around 30% overnight, without use and whilst on airplane mode. This also happened a few weeks ago, in which I reset my phone and didn't get the issue again until now. My app usage in the background did not go up, so I am wondering why did this happen? Is there any way I can prevent this further, since I already have background app refresh turned off and other battery settings turned on?
iPhone XS