My phone shuts off at 20% battery

I noticed many times the phone shuts down all by itself at circa 20% battery. When I try to turn it on again it says it's 0%

What is causing this?

Isn't there a way to reset battery stats?

I remember there was a setting in the recovery of my Wildfire S but now in TWRP I can't find anything. My current configuration of the M7 can be found in the below signature.

Thanks to anyone that's going to help!

Phone randomly shuts down and loses all battery

I own a Samsung Galaxy S Advance I9070 and i've got a problem with it. for the past 3 weeks, it randomly shuts down, and drains all it's battery, and won't start until i plug the charger in it, after that, the battery goes up instantly to somewhere between 70%-100%, and then i can open it without any problems, then. it works for a couple of mins and it happens again. I even did a factory reset but the problem persists .

Damp phone shuts off after boot finishes.

This starts out a little weird.

I woke up, grabbed my phone and discovered it was wet. No particular reason for it, no liquid anywhere near it, no ceiling drips. It was a clear liquid, but a little more viscous than water. I finally decided either my cat puked on it, or this new house has a poltergeist and my phone got slimed...both equally bizarre and unlikely options. I wiped it off and thought little more of it as it was working fine.

A couple hours later I discovered the phone was off. I powered it up and it made it through the process, did the second vibrate and displayed a home screen for maybe half a second before displaying a "System shutting down" TOAST and powering off. Forgetting the morning fluid thing, I tried a few more times and had the same result.

I booted into recovery just fine and wiped Dalvik and rebooted with no improvement. I did a factory reset in recovery and that didn't help either. Opened the cover and found there was a lot more liquid in there. I pulled the cards and battery and put the phone in a tupperware filled with desiccant and left it overnight. Today it booted briefly to the setup screen before announcing a the power down.

My question after all that, does the OS (CM13 at the moment) have some sort of built in safeguard against booting with moisture present which doesn't exist in TWRP? Since recovery is showing no problems I was considering restoring a nandroid backup or maybe just reinstalling. Could there be some sort of software toggle which needs resetting?

Thanks.

touch doesnt work afterscreen lock and phone shuts down

hi.. i was using my xperia tipo dual.. my touchpad wasnt working properly so i got it changed. after using new touchpad the touch works fine but only until the screen is unlocked. after the screen is locked, when i press the power button, touch stops working. and after few seconds phone shuts down.
however after the screen lock, keys work fine only the touch doesnt work.
need help.
its irritating.
tried resetting phone.. no change.
the device is rooted.:confused::confused: