Z1 Bug or what? HELP PLS

[Markyphua]

Hi people, 

I need help urgently, for some reason when my phone is left alone for more than 6 hours or so (such as when im sleeping while im charging it) my phone becomes unable to listen to play music while being on silent or vibrate mode. When i open the walkman, and try to raise the volume, it just shows me the silent icon. In this "mode:" i can only listen when not on silent/vibrate and to fix it i have to restart my phone... This is really getting on my nerves as i have to keep on restarting my phone, need help urgently.

[_alexdon_]

Boot the phone in safe mode,see if the same occurs:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008

[FrontierGate]

What is your phone's firmware version?

[Markyphua]

How do you check that??Anyway im guessing you're asking android version? Which is currently 4.4.2

[_alexdon_]

Settings-about phone-build number.

[Markyphua]

build number is 14.3.A.0.757

[_alexdon_]

Didn't you get the .761 update?