So, when I'm in a call, the screen goes black when I hold the phone to my ear, as it should. However, when I move it away from my ear, the screen should light back up, but does not, so I am unable to end the call. Instead, I have to press the power button. Every other Samsung phone I've owned (since the GS5) would light up immediately once I pulled it away from my ear. Any ideas on what is going on here? TIA.