Built-in mic failure on my new iPhone 3G

Wondering if any one else has seen this issue:
For about 4 or 5 hours this past saturday, I had a one-way audio issue on all my phone calls; where I can hear them but they cannot hear me!
It occured on all incoming and outgoing calls during this 5 hour period.
BUT, while the phone was in this problem state, I discovered that if I used the headset, people could hear me just fine!
Then later that evening the problem went away without me doing anything special (I did not reset phone or anything).
The problem came back the next day for about an hour.
-So, has anyone else seen this?
-It hasn't been 30days since I purchased the phone, I guess i should be able to just walkin th estore and ask for a replacement...??
iPhone 3G with 2.0.2 firmware

So...the Muted-Mic issue continued to happen. I also had a variation of it, where, the person on the other end of the call heard static/crackling noise.
The static noise issue (just like the muted-mic) went away as son as I plug in the head set on my iPhone 3g...Using the head-set the other end can hear me with out problems.
The likely culprit is the built-in mic. ( of-course it could be something else, but the mic is the most likely thing...it could be loose or something).
....So I take it in to the Apple Store (Genious Bar) Twice.
On my first visit they did not exchange it...Since the issue did not occur during a 1min test call he did...he asked me to take my phone back and see if it happens again.
...of course the issue happened again.
On my second visit, the Genious suggested that there might be a problem with the SIM.
...I was TOTLLY APPALLED by this response.... Read my original post on my problem, and you can probably infer that the SIM is a very unlikely source of the problem (...also, I'm an Cell Phone engineer for a large company for 8.5 years...so I know a thing or two about how cell phones work).
I did not tell the genious I'm a Engineer ...Maybe I should've.
After trying to explain to the genious that his suggestion of changing the SIM was not a likely solution he finally agreed to exchange my phone...The phone is under warranty if they want to debug the phone swapping SIMs etc...they should do this on their own time...not mine!!!
(he changed the phone and the SIM!!).
So if you see this issue, hope you can get service without having to go back several times, and getting the run around before they exchange a defective unit.

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We would like to inform you of the availability of an optional Bluetooth® firmware update (HW05-SW01.27.20) that enables Bluetooth AVRCP control and metadata display from a compatible Pioneer CD or DVD Receiver when used with an iPhone® 5 or iOS 6 device. If you do not own an iPhone 5 or iOS 6 device, there is no need to install this update.
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Questions
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