z750a randomly shuts off

I'm currently using the sony z750a.

I got this a while ago (less than a year). Sometimes the phone will just instantly shut down. No power down. Nothing. Just BOOM... Black screen.

Sometimes the main screen will pop back up. Other times, I have to pull the battery out and pop it back in.

Is there an AT&T firmware update or some sort of firmware update that solves this or no?

I have done master resets before. I also checked the at&t forums and there's some people with the same problem.

Thanks,

wlfpck

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Newbie to phone modding. Not a newbie to car modding.

I drop my phones.