Hi, I have had this issue about yesterday night, the phone wasnt responding as soon as the battery ended and the phone shutdown i tried to charge the phone then waited for hours still couldnt figure out whats going to be the solution. Today, I went to the local repair shop where the phone was diagnosed with the "Display panel's ribbon" which was damaged by the short circuit due to the water damage (which happened 2-3 months ago) or may be the phone fell down on the cemented floor earlier in this month, but the repair shop guy repaired it in like 20-25mins and yet its running smoothly again Alhumdulillah! Try getting your phone diagnosed by the repair shop. I hope it will work again!
[Edited by Moderator]