Xperia U Wi-Fi Problem

[djnp]

Hello all,
I have instanlled Android 4 at my girlfriend Xperia U and after that she got that problem :
When trying to connect any wi-fi router it can't (icon of wi-fi show that it is connected but there is no internet) and the other devices that is already connected with router, their internet also stops! When i disconnect the "U" other mobile phones / laptop turning back to normal way and internet work fine for them again. Any help?
P.s. Pardon for my english.

[Sam]

If this has occurred after an update it would be worth while running a repair to rule out any error that may have occurred during the update.

To repair the phone software
1.     Install PC Companion on a Windows PC from Support
2.     In PC Companion, under Support Zone and click Start.
3.     Under Phone Software Update, click Start.
4.     Click repair phone.
5.     Follow the on-screen instructions. 

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[Heresy]

The only recommand: give up and root your phone.

This is a known issue of Xperia U with ICS firmware, but Sony doesn't care it, and never try to fix it at all.

reference: http://talk.sonymobile.com/thread/61446

[Nari]

Even i am using xperia U Gingerbread version.. I am also having this problem. I don't know how to make work... Can anybody help me to do this?