suddenly gets restart...

[anbuahpv]

when iI am using Mobile internet (fb), will get restart and the mobile get heat in back side...

and iI hearing the songs via headphones that time may call will appear, the total sound are muted. and again me restart the system only to work perfect..... and touch get slow with in one year.....

so can anyone tell me the reason and solutions for my problem.....

[Alexander1]

You could start your phone in safe mode to see if the problem may be related to any 3rd party apps you have installed in your phone:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

If the problem persists in safe mode I suggest that you repair the phone software using PC Companion:

http://www.sonymobile.com/update

In PC Companion, press start on Support Zone > Start on Update the phones software > "Repair phone".