Iphone 3GS not ringing/vibrating when called.

Hello,
When I call my Iphone 3GS with another phone (while in sleep mode) , the Iphone does not ring nor vibrates.
However, when I push the home button while the call is comming in, the Iphone awakens and starts ringing and vibrating.
If the home button is not pressed the Iphone remains completely silent.
When I restart the Iphone it works perfectly for a few times and then shows the same problematic behaviour again.
I've updated the OS to the latest version, restored the Iphone a few times, nothing helps.
I found someone with the same problem saying that it is a battery related problem, so I've changed the battery and it didn't solve the problem.
The problem also persists after changing to a different opperator. (I didn't switch operators to solve this problem, it had other reasons, but does excludes it as a possible solution)
To me it seems like a software problem. Anyone any ideas on how to fix this?
Thanks
Jonathan

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