I have this problem when making a phone call. I'll be talking on the phone and I guess my cheek hits the "add call" button and the phone goes to the number pad screen, I know this because my caller on the other end can't hear me. I have to quickly back out of it back to the call screen for them to hear me. Like I said this is all my doing but are any of you doing this or have some kind of solution. Once I the caller having trouble hearing me I know exactly what it is; thats how constant it is.