I have the same problem in connection with mTouch button factory defect in all Meizu M3s smartphones.
Button is guaranteed to break after 1-6 months: mTouch sensor and a fingerprint scanner stop working. Moreover, after the break of the Home button, the smartphone starts to spontaneously hang and reboot. Button replacement under warranty solves the problem for a few months, then Home button will break again. Again! Not only in my phone!
I ask you to support the petition to Meizu through the folowing link: https://goo.gl/XmwMjk