I've had my M8 for a couple of months now, and I have been having an issue since I got it, where my face pushes buttons while on a call. Usually it pushes the mute button, which is a huge pain. Happened 3 times on one call yesterday. When i did an online chat with Verizon, I got the usual "turn your phone off and back on" followed by "perform a factory reset." Is anyone else having this issue? Am I just holding the phone like an idiot? Is something wrong with my proximity sensor? Can I change a setting to fix this? Please help! Thanks!