why is my phone Automatically shut down ramdomly

[Android Central Question]

Hello my friends...!!
I need your help...
I use Meizu M5 note phone.
It's China version phone...
But it runs gobal rom...
I update my phone to 6.0.0.0G ...
Now my phone automatically shut down ramdomly....
Now I connect my phone to the charger Then I do my work with phone...
If I disconnect the it my phone shutdown in random time..
why is that....?

I brought my phone one year ago..
Is it software problem or battery problem...?
please help me to Fix it...

 

[B. Diddy]

Welcome to Android Central! If it started happening right after updating the phone, then I'd guess it's a problem with the firmware. Was it an official system update from Meizu, or a custom ROM developed by someone else?