My Samsung Galaxy S7 Edge charges fine, battery life is good all day while it's on and I'm using it. The last few nights I've turned it off for the night at anywhere between 90%-100%. I don't plug it in since the battery is almost or fully charged when I turn it off. When I wake up in the morning and turn it on it's at 3%. So the battery is draining while it's off. I guess I could keep it plugged in all night to stop this from happening but I'd rather know why it's happening and if it can be fixed. Anyone have this happen or know how to fix it? TIA