Random notification sounds after JB

[fantic]

After I updated I receive random notification sounds. It is the same sound I use for my text notification. I look at my notifications and nothings there. There doesn't seem to be a pattern.

 

[Federico Aroca]

I have the same problem. I have android 2.3.4 and every now and then it sounds the notification ringtone (not the SMS one), but only half-way, sometimes more, sometimes less. I haven't found a solution yet. It's not a virus, nor whatsapp (it's the ringtone I use for whatsapp).
If you find out what it is, please let me know