Xperia Z wifi problem

[Endust]

i using my xperia z about one week, one day, i realised that my wifi conection keep disconected,when i turn on wifi it conected and then use about 5 second it discconected from the wifi. when i go to settings and manually reconnect it, its say failed to connect to network, i do to forget the wifi and retype the password, it can then use about 5 second it disconnected and cannot be connected  why?

[Uliwooly · Accepted solution]

http://talk.sonymobile.com/t5/FAQ/Wi-Fi-problems/m-p/348104#U348104