LG G4 Battery running down in 8hrs with 2h 16m SOT

[mrchigama]

I absolutely love my G4, the camera is great, the screen huge.

Of late my LG G4 battery is draining very fast, I used to get through a full day with more than 4 hours SOT. Now I can barely get 2hrs SOT.
I installed wakelock detector to try and troubleshoot the problem but I'm hitting a brick wall. The phone has 60-80% wakelocks on some days.
I'm on Android 6.0 Build number MRA58K, Kernel 3.10.84 and Software version V20f-ZAF-XX

Can you help me fix the battery drain. I can provide more info when requested.
Here are screenshots from GSAM Battery monitor and Wakelock Detector.

 

[B. Diddy]

Welcome to Android Central! Can you also show us the graph with the cell signal strength? Poor signal can eat up battery.

 

[mrchigama]

Thank you.
The phone is on 3G. Here are the GSAM phone signal Screenshots

 

[B. Diddy]

The signal seems pretty unstable, which might be why battery is being drained more quickly. Notice that in your second screenshot, when signal is more stable at the High level, the battery drain levels out.

Are you on 3G because there's no 4G in your area? Or is the 4G signal weak? If the 4G signal is weak, it may be that the phone is expending energy trying to latch onto 4G, then having to drop down to 3G. Try going to Settings>Mobile Networks>Preferred Network Type​ and select 3G only (if you haven't done so already).

 

[mrchigama]

Now that you mention it, it really looks unstable. Funny enough From about 18:00 to 07:30 I'll be in the same place and the network seems to be fluctuating a lot. That levelling out on the second screenshot the phone wasn’t being used.
I’m using 3G because there is no 4G Coverage and the phone is set to 3G only.