Problem Wifi

[sakura10]

For about 10 days I have big problems with the wifi
If I restart the phone take immediately signal while if I leave the house at the back there's no way to connect, i must reboot the phone (sometimes solve through mode plane)
How can I fix? I had already happened in the past and then suddenly the problem is solved.
I have already done two full wipe without solving.
Currently I have the smiui rom

 

[ZoXoR]

I have had problems with turning on WiFi after I had manually edited the wpa_supplicant.conf file. If you have no idea what I am taking about, ignoring this message. Anyway, in my case I had to delete the file, since it was corrupt and then reinstall ROM update. I don't think it is the same problem as you are having, but I thought better to share this anyway.

Sent from my Xiaomi MI 2