iPhone SE (2016) sudden battery drain and/or inaccurate battery level on 13.4.1
I would appreciate any advice with the following problem. I'm not sure if it is a problem with battery drain or the battery level indicator, or both.
A couple of days ago, the battery on my iPhone SE (from 2016) started draining extremely fast - e.g. yesterday, from 100 to 2% in just over 3 hours, with virtually no use; today, a drop from 72 to 39% in 1.5 hours while on airplane mode and locked, with no apps running at all. But the battery level then stayed on 39% for over an hour while browsing (and is still stuck on 39%); the battery level also shows as unchanged in settings, which should be impossible with the screen on, etc. This leads me to suspect a problem with the battery level readings rather than actual battery drain. (Battery health is reported as 91%.)
The phone is running 13.4.1, and had been for a while (auto-update is on) before this problem started. I haven't changed any settings, dropped the phone, or done anything at all that would correlate with this problem starting.
I have already tried turning the phone off and on and force reset - the problem continues.
I would be grateful for any other suggestions. Thanks! :)
iPhone SE