Never had any issues with Wifi on on my Iphone until I upgraded to iOS 6.1 since then when I am at home or simply using a wifi network and my phone is left idle for a few minutes I no longer get any push notifications for imessage, facebook, whatsapp & emails when I do pick up my iphone and unlock it.. it still shows that its connected to wifi but no internet works on the iphone I have to disconnect from wifi and re-connect to fix it
Tried to reset network settings and tried to reset all settings even restored my Iphone and started as a new Iphone
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