For quite sometime now when ever Im on a call my data connection drops out. I know my phone supports voice and data over LTE but its not working for some reason. Ive checked all the settings and voice and data are selected in the cellular preferences. Ive tried restarting reseting network settings etc and it still drops to 1x whenever Im on a call and I cease to get any texts or GPS updates until I hang up. Any idea what is causing this?