I'm confirming now that this is definitely bluetooth related and that the volume goes low after I connect to my Jabra unit. The unit I use is the one that you clip on the sun visor in your car. I don't have the model number handy, but it works fine when it's connected. Once I disconnect the bluetooth, I lose the volume on everything (incoming ringer, notifications and even when I just play audio from the web). Once I turn off the phone, it's all good again. I can repeat this every time. I'll keep you guys posted as I find more info on this, but definitely going to the Sprint store sooner than later.