U need to replace your battery. Mine started to act funny and it would randomly shut off even though it showed I had a charge. It was all over the place - 30, 50,80, 15, 10,95%. It didn't matter. After it shut off it would display zero charge when I hit power button. As soon as I put it on charger it would show whatever the previous charge was. So for example if it showed 30% before it shut off, it would show that after I put it in charger for a little while. But if I removed charger and turn back on it would go on at first, but then shut off not long after. It git progressively worse and fast. It got to the point where I had to keep it in a charger or have a battery pack on it in order to use it. And after a while it seemed the battery pack wouldn't even revive it only actual charger. Anyway I did factory reset, conditioned battery and nothing worked. I found this site and ordered a battery kit and I just replaced my battery and it works great. Very happy because I basically have a new phone now. As far as the replacement procedure, I suggest u take your time in order to prevent damage when u take it apart. I do have some more tips that might help, if u are going to do it. Just let me know. Good luck