Coming from a bootlooping V10, I bought the ZMAX Pro Pre-paid from T-mobile. @mrjlwilliams great videos on the device were my leading factor in buying this device since there was so many features for such a small price. A couple months later I started noticing some issues which did not bother me that much. My headphone jack was acting up, I thought it was my headphones at the time but realized it was a recurring issue, The sound would often play through the speakers or not play at all. After I gave up on the headphone jack another problem came up which involved the volume buttons. Does anyone have the same problems that can help.