speaker problem

[xperiaMT27i]

when it's playing music ,instead of playing from the back speaker ,it plays from the ear speaker all the time.Generally,my back speaker doesn't work well.

[_alexdon_]

Try to clear data for smart connect.Also,you could try to unplug the headset while listening to music or while in a call.

[Alexander1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

You could also try to restart your device by press and hold the power button and volume up at the same time until the device vibrates. 

[xperiaMT27i]

I switched the phone to safe mode and when I exited the speaker worked ,but then,after a week the same problem appeared.

I read somewhere that the software has a problem.what can I do with it?

[Alexander1]

If it worked in safe mode it sounds like you have an 3rd party app installed that is causing the issue. 

Otherwise I can advice you to reinstall the software using PC Companion: 

http://www.sonymobile.com/update

In PC Companion, press start on Support Zone > Start on Update the phone/tablet software > click on the blue highlight (Repair my phone/tablet). Do this without the phone connected. Follow the instructions on screen to perform the repair.

Before repairing the software in your device you may want to backup your information first. Check out this topic for more information on how to:
http://talk.sonymobile.com/t5/FAQ/Backup-amp-Transfer/m-p/407253#U407253