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My wife's A7 Mini started making a chiming sound at 10:00 PM. She was already asleep so I looked at the phone and couldn't see why it was chiming. It did have several apps running so I ended them. Then I powered it off and forgot about it.
About 5 min. later I heard the same chiming sound. When I looked at the phone it had no apps running so I thought maybe I just missed the Power Off click. So I made sure this time the phone really was powered off.
5 min later the same thing happened again. This time I noticed a small clock symbol on the top line, so I went through the apps and saw that the Clock app had the same symbol. Upon opening it I saw it had an alarm set for 10:00 PM, so I turned that off and powered the phone off a 3rd time.
It hasn't started chiming since then.
Apparently it is possible for the phone to turn itself on, even when it is off. Is this something only I don't know about? Should I be glad phones can't walk and manipulate things? Should we all be very, very afraid?