Anyone else having this issue? During a phone call, it will make a random high to low pitch beep lasting a few seconds...but is incredibly loud. Enough to make my ear ring. Will give no warning, no message, just kind of fade the call and start the beeping going on. I've powered it on and off, Reset it, and took it to the local Verizon store, but they think its an Apple issue. Just curious if anyone else is having the same problem.