iPhone SE/A1723 problem since last upgrade iOS15.2
I have an iPhone SE/A1723 . Since the last upgrade to iOS 15.2 it is behaving strangely!
After I charge it, and it shows 100%, suddenly it drops to 9% and turns off.
Sometimes when I charge it, it seems to drain it rather than charge it.
It keeps switching off, I turn it on again, and it shows that it needs to be charged, but then suddenly has 60%.
Twice, when it was on DO NOT DISTURB it started playing a radio station in the middle of the night.
It's completely unpredictable.
I must add that my iPad is also behaving strangely, since the upgrade, but not as bad.
What could be the problem?
iPhone SE