Why does my phone connect to a wifi network and then disconnect after 3 sec?

[AC Question]

my phone connect to wifi network and disconnect after 3 sec

hello.. i have a note 3 and one day it just disconnect the wifi by itself and when i connect it again it stick for 3 sec and disconnect by itself ...... i tried everything
the problem is that my phone connect to every router except my home router although my brothers phone is connecting the wifi just fine ....... i dont know if its from the router or fro my phone ........please help
thank you

 

[Metal god]

Re: my phone connect to wifi network and disconnect after 3 sec

*it could be interference from other WiFi networks.*Try downloading WiFi analyzer.

 

[Mohanad Hamed]

Re: my phone connect to wifi network and disconnect after 3 sec

how would i install the wifi analyzer if my phonce dosnt connect to the internet