I have sony xperia xz for 5 months and i started to heat too much i can not hold my phone and i know if i use it thos temperature will harm it but i have to use. It start to heaat with its battery i started to think i wasted my money i gave 2000 Turkish liras to it but it do not deserve it. I hope it can solve with another update also it has performance peoblem with some games.
