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My Neo V have 7 days and my contacts sound resetted some times!
...or some time played default sound, some time assigned... 
if V play default melody in contact settings i can see right melody, but phone dont play it! 
Whats wrong with SE?
(i say about custom mp3 files from SD as ringtones. is it possible??)
Solved! Go to Solution.
did you tried SUS or PCC? do you have any app that might be blocking this? another Dialer, launcher, messaging app?
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do you have ICS or GB on your phone? do you have any of this apps?
taskiller
antivirus
battery/juice defender
if you do delete them.
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ICS, from PC Companion suggeston
"taskiller
antivirus
battery/juice defender"
NO
so you don't have mcaffe? try to repair your phone with PCC or SUS
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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Repair???
My phone broke?? It is only 7 days!
there might be a bug/software issue.
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are SUS reset al my data and apps?
that's a tricky question, sometimes it does sometimes it doesn't.
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useless
Last night was the correct melody
morning call - standard! (((
immediately called again - the correct melody
enigmatic ((((((