Yes, finally, I tought I was the only one with this problem on this phone. I CAN NOT EXPRESS MYSELF HOW GLAD I AM TO FIND THIS.
Ok, so my phone battery usually lasts a day with chraging every night, yes, the battery can jump from 100 to 84 in few secs, and when it's below 50 or 30 it can show 0% and then there's a popup saying "shutting off" and obviously it shuts off. When I turn it, it shows the battery percentage that was before the shut off, or sometimes less than 15%. The worst part of this is the random shutting off part, when I DON'T use it, it turns off and makes a noise, and if I hear it and turn on the screen it says shutting off with 0 % battery. I get so many missed calls because of this and it's pissing me off.
Now, I replaced the battery with a fresh new one, the old one was bloated. I factory reseted the sh*t of the phone, I've done it about 4 times total since I bought it used and after replacing the battery. When I restart it, it looks promising but later it continues it's buisness. I don't know what to do next.
I think the solution may be hardware not software, and I think that it could be something on the battery sensors or something, like the wire skips a pulse and it thinks that the battery has runned out. So I was thinking to replace the main part of the phone, the motherboard or the something, but I can't find it anywhere and it'd probably cost alot, since it makes half of the phone.
Any help is appreciated!!