Anything you have done before this problem occur? It is very hard to debug meizu phones, I would suggest you go to a service center. If you still considering it is a software issue, please try reinstalling or updating the firmware with cleardata.
I buy Phone 3 days ago. I think, phone not new, Refurbished phone (I can see screen change, they sold me as a new phone :/ ). Problem can be battery :/
Phone was Flyme 22.214.171.124G. I just installed 5.1.12G firmware (data clean) two days ago. I have regular apps, mail, social apps,
I don't play game.
I used battery calibration app 30 minutes ago, may be solve this problem. I figure out someting end of the day. I hope .