Seems to have occurred since the 7.0.3 upgrade. I'll plug my phone in and mostly find I don't hear the connection tone just a double vibrate. If I'm lucky to get the tone you can guarantee ill unplug and lock for example and not get the lock click or any call,text or email notification at all! What on earth could be wrong? It's not physically switched into mute mode or even DND as I've checked! I'll just randomly get notifications again sometimes after plugging it in. Like I say it's random, anyone able to shed some light on this on my iphone4?