Mi 4 is the worst phone and the heat generated cab damage the organsof your body.during night I kept ghe phone playing some video.i got up due to heat radiation from the phone .few times it has damaged tje skin because of the heat generated .i purchased on thr confidence that will see only good product.now how to solve my problrm to seen .then after facing some issues I send replacement request .again I checked all its functionally also I checked the phone of my friend but following issues are cimmin in all