Iphone 5 other person can't hear my voice - possible fix.

Hi all
I have a 2 month old iphone 5 replacement from Apple.
Randomly around 1 in 10 calls the receiver says they can't hear my voice. Normally I will stop the call and it takes around 3-4 more calls straight away to rectify the issue. Highly annoying. This happens on the car kit bluetooth parrot as well as pulling over and calling normally.
It was always my wife's number that seem to have the issue so I called OneNet (vodafone) to see if they could see any issues and after around 10 examples and call logs they can't find an issue. I actually got the same issues with some other landlines also so know it's not just one number now.
Anyway ... Having read many similar iphone 4 and 5 5s threads I tried:
1. Reset my handset and restored by iTunes to 7.04 and then my iCloud backup.
2. Changed the sound settings to hearing aid mode and mono sound and also disabled the sound cancellation option. (Incase it was a mic issue)
3. Tested at home and when the call failed once out of 5 attempts, found out that it is fine if you turn on the speaker mode.
However ....
I have had the call voice fail again and this time I sat there with the two handsets wondering why it wasn't working. Pressing the mute, and speakerphone etc.
I then found out that if I pressed the home screen button and then "setting" followed by the turning off the bluetooth the voice suddenly came back on the handset!!!
Is this a iphone bluetooth bug??? Does the iphone think that it stuck on a bluetooth device when you jump out of a car? Or if you are in a busy Supermarket and it's trying to find bluetooth devices? Does the bluetooth being on confuse the mics?
Why when I turn off the bluetooth does the audio return to the receivers iphone? It must be that the iphone thinks it has a bluetooth device connected. This is why when you select speakerphone it works also.
As I have said this has worked twice now so I will be leaving my bluetooth off unless I am driving to see if it cures the issue.
I am certain this is not a hardware fault as my wife has had this with her iphone to me also once so why would she also have the issue on her iphone 5c?
I know this is not the fix for everyone as some users do have hardware issues and are hitting their devices and some are putting cardboard into the iphone.
Apple if this is a fault with the bluetooth then please look more into it on your next update, however it may just be that it's my old carkit or any other bluetooth devices interfering with our iPhones.
Perhaps having the bluetooth on confuses the iphone randomly into thinking it's connected to a listed device when it's not, muting the mics.
Any other thoughts on this?
Cheers all

Iphone: Hardware troubleshooting http://support.apple.com/kb/TS2802

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