iphone 4s notification sounds intermittantly stop working

[pnd4pnd]

this one is driving me crazy - occasionally my txt notification sound just stops working yet the ringer still works. if i go into sounds and try to change the tone none of the selections make sounds. the only way i know i got a txt is that the vibrate works and the screen lights up. then all of the sudden it just starts working again (i use the glass tone).

i really can't pinpoint anything that causes it or gets it going again. has anyone else seen this or have any ideas?

thanks,
eric

 

[Foxtrot29]

I have the exact same problem. The slider on the lock screen makes no noise, the keyboard sound is gone, no notification of new messages, etc...

I reset all settings and still no luck. I'm out of solutions.