Whenever I'm in a call and I happen to get a text message, I hear a "beep beep" notification that plays twice (=4 beeps).. however.. in the (now constant) event that I happen to receive multiple text messages at once (and sometimes only one), the "beep beep" notification will persist.. even when I hang up the phone, I can still hear the beep. Even during its power down, the beeps continue! All the way until it actually shuts off... and its incredibly annoying! How do I disable the in-call notification? I'm FOR SURE its not from my texting app (GoSMS) because I disabled it a long time ago...