Unbelievable. My iPhone 6s has been perfect for 10 months, then quits cold turkey 5x in 16 days. At all times my battery was between 32 and 42%. Phone totally dead; once plugged in, immediately refreshes to same battery level.
Apple Chinook genius told me to put it under my armpit!!! Yes. Really. Said it happens all the time.
Couldn't post the review unless I gave it a star, but none deserved.
My iPhone was replaced by another Apple Store.