My iphone 4S is VERY slow to connect to wifi.

So my iPhone 4S is not connecting automatically to the same home wifi that I have had for months.  It is also not recognizing all of the available networks.  I I open the wifi settings, it will eventually connect but once it locks, it does not automatically rejoin the network.  Any thoughts?

i had the same problem, and also had this problem with mountain lion. i changed the MTU on my router to 1300 and all working perfect.

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