My phone keeps losing signal and won't connect back until i restart the phone, this can happen up to every hour. Whenever this problem happens, i would not know that i've lost signal until i want to use my phone as it does not show no signal, the signal bar either sits at full(but still no service) or empty(but theres no notification). All other services ie.wifi, bluetooth. works fine except for all services and setting related to phone signal.
Toggling airplane mode on and off doesn't work, pressing on search for network manually doesn't giv me any results, pressing on search for network automatically shows "registered on network" but i would still have no signal.
I've tried using xperia companion to repair the software, doing a factory reset, changing the preferred network type to every option and dialling *#*#service#*#* and *#*#4636#*#* to change the settings from there but problem still persists. Moreover i've already changed my sim card twice and even sent it to Sony to repair 4 times, they tried software repair, changing motherboard, software upgrade and lastly they did a 1 for 1 exchange of device but the problem still remains.
