Why does my Galaxy s6 stay on by itself every time.?

One day it fell in water and I tried to put it on rice but after I took it out it won't stay off. Like the power button would turn it off but it would still come on. How Come?? Please help ASAP.

from Android Forums at AndroidCentral.com - Ask a Question http://ift.tt/2rGRI6i
via IFTTT