Yesterday when I was playing Modern Combat 5 on my Xperia Z, the screen suddenly went black and I thought it was just a reboot.
However it wasn't going to reboot - the phone powered off! I have to switch it on manually and nightmares were approaching.
Then, the condition became more and more serious and the phone often automatically powered off.
I thought it was rom related so I re-flashed stock rom via Flashtool and wiped everything this morning.
Now it's even not able to boot - powers off when displaying boot animation.
If the phone is connected to a charger, it won't power off and works like before.
Why and how can this problem be solved?