Share your experience!
Hi....So sometime last week my Xperia was telling me it wanted to do the latest update....Not sure which update it was exactly. Anyway i did it and now my phone goes through these random freak out sessions where it just vibrates and makes this weird notification sound flat out. I have no idea why. It goes on for ages. It has also messed around with my message tone. Sometimes when i get a message it will be my usual notification sound. Other times it uses a different sound. What the?!
Repair / Update Service
Update your phone for optimum performance and get the latest enhancements. Regardless of whether you have the latest software, it’s a good routine to run the Update Service to improve software stability. Also, if you experience problems with your phone this may be solved by a software update.
http://www.sonymobile.com/gb/tools/update-service/
MAY BE THERE SOME BUG IN YOUR UPDATE, SO TRY REPAIR,HOPE IT WILL WORKS...