Wi-fi problem..No final fix?

I have this phone for about 2 years.

Any rom,custom rom,patch,tweak don't fix wi-fi automatically disconnect problem ( wi-fi drops )

I'm on 2.3.4 Stock because is the only who work wi-fi.

In this years of developement,nobody know were is the problem ? or any fix ? ( some devices wi-fi , some lot of phones ,what is the problem ? )



Thank's