The problem is the same of xperia Arc, because the firmware is the same and probably the wifi radio too. In the discussion of xperia Arc emerge many things, probably a bad stability in the wifi radio of the phone, or an incompatibility between router and phone, lack of stability etc
I have the same problem, sometimes it drops without reason, moreover when you are downloading a huge file, 500 mb or so. Other times when you are browsing the web, the icon dissapear and then reappear or it stay locked but you have not connectivity and the loading of a page stops and restart after few seconds.
Like i said in the arc discussion, my 4 years old nokia 5800 never disconnected with same router and configuration, the Neo does it.
I hope ICS will improve stability, but is inacceptable a thing like this from a brand like Sony
