Settings changes

[n20]

Hi there,

i am using Xperia M Dual ,my phone changes settings automatically it means Sound settings,Display settings and Ring tone.And my Walkman dosen't work properly.when i stop playing a song Walkman automatically close.Please help me 

[_alexdon_]

Check if the same occurs in safe mode:

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