I had that problem or actually my husband did. With the iPhone and they went inside of it and fixed the receiver of the phone. It can happen they said and just come back if it does I was told to do.
There has been alot of non connection although showing 3G lately do that might be an issue for Siri not just the web browser. Do u have Siri turned on?
I would like to make sure your device functions the way you expect it to. Please tell me more about what is happening with Siri. Are you receiving a specific error message when using the program? I regards to the audio of your phone calls, has there been any physical or liquid damage to the device? I would suggest attempting a reset of the device by holding the power and home keys for 10 seconds until the device restarts. If you are still experiencing these concerns we will have to attempt a restore of the device. Here are instructions to complete the restore through iTunes. This will be the last step before we can review the warranty options available on the device, if necessary. Please let me know if I can provide additional assistance.
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