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Hard to say, it could be an app acting up, if it happen again, repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
It may sound stupid but it may have overheated and switched off after giving you a warning tone, Was your phone hot?
Hi,
Sounds strange. Does the phone work correctly now or have you experience any strange behaviour after this?
Happened to me too once, basically the phone crashed and auto rebooted, the beep wasn't really a beep but the sound glitching out. To me it happened while the alarm was ringing. I don't know what's up with that, it happens sometimes with this phone, asked if anyone else was having the same issue but nobody replied. Now I know it happened to someone else.
@Uliwooly , i dont think there's need of a System repair after 1 bug . That bug might be as said before a system crash and the phone just lagged up with some proceses and it rebooted. To much actions in 1 time may do some kind of these issues. Also you could have a full RAM , when you finish with a app close it by sliding the windows of the app's you currently dont use or need.