When I try to use my Bluetooth to initiate a phone call, the voice dial gets disconnected while I have the phone within my pocket or in the belt holster. If I take the phone out of my pocket or holster and hold the phone sideways in my hand, I can initiate the phone call. I have also noticed when trying to enter my password for the voice mail box the screen will black-out but I am still connected. I have turned off the knock-on feature without any difference. Is this something that is fixable without making a trip to the store to get a replacement: still under warranty. I am running lollipop on the device.
