My phone has wakelock please help

[Holmes4th]

I have samsung Galaxy S6 Egde plus it's is a demo phone.
this is what happen. i at 1.30 am i saw battery is still 80% and then i woke up it's 0%

so i've search it could be a wakelock. i loaded wakelock detector


i cant use it fully option
goo.gl/Yqdh2F i followed these step and i stuck on slide 7
it didn't found my device i dont know what to do now..
Edited..
Now i can move on slide 7
can anyone help me is my phone is wakelock or it is normal or it's about hardware could it be battery problem

 

[B. Diddy]

Welcome to Android Central! It might not be the wakelock that's causing problems. Your cell signal strength doesn't seem very good -- poor signal can eat up battery.

Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:


1. The main Settings>Battery screen.
2. The fullscreen battery graph screen (which shows Awake time and Cell Signal Strength).
3. The Screen category (to see total Screen On time).
4. The Cell Standby category, if present (to see Time Without Signal).


Use GSam Battery Monitor to get the Cell Signal Strength graph.