Samsung S7 Not entering deep sleep, not rooted

[androidfan456]

Hi.

I have a GS7. I was really excited about this phone. One night, I set the phone as an alarm, and When I woke up it drained from 99% to 76%, with 11 Apps running in the background. I know thats not normal. I need people who know what they are doing. I am not willing to go to a local tech store.

I have the Snapdragon 820 Version.

Please help!