Does this only happen in your house or does it happen randomly?
I used to experience this issue, but also when it happened, I could hear the person on the phone, but they could not hear me. Also, it only happened in my house. What was happening is that: 1) I have comfort access, 2) I do not lock my car when I get home so the car wasn't shutting down right away, 3) the phone was retaining bluetooth connection to the car until the car shut itself down. I had this issue with both an iPhone 4 and an iPhone 5.
I could fix the issue by locking, then unlocking the car when I get home. I hardly ever did that so most of the time I just missed calls for a while after I got home. Or if I noticed them, I would click the speaker icon and redirect from the car to the phone.
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