Share your experience!
while listening music from any player (with or without headset), if some1 calls u , then volume goes dead
to solve this , i used to put call on speaker ..
else i hav to restart my cell to get things working again
this is happening with many xperia u mobiles ..
repair/update your phone with SUS or PCC
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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