Re: Wifi disconnecting.
Hector - you don't say what "update that popped up" you're referring to. If it was an update from ICS to Jelly Bean then you probably want to do a Factory Reset.
WiFi is pretty stable on this phone, so if it was working fine and then suddenly started having problems after the update, the Factory Reset will be your best bet.
As the previous poster mentioned, deleting the WiFi connection and recreating it may help. You could even try setting the router to Open (ie no security) and see what happens, although you don't want to leave the router configured that way.
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