I have zenfone2 500CL since less than a month. There is a huge problem with network connection. I use fastweb operator same that I used with other phones. when I am in places with no network and then go back in places with optimal network the phone can not update the signal and only emergency calls are allowed, I must reboot phone every time. Moreover This happens also when fasrweb network is low, the other phones went in roaming on Tim, but zenfone just loose signals even though I change place. This is a huge problem, please how can it be solved?