Share your experience!
The problem has been reported by many users (me included ) here :
http://talk.sonymobile.com/t5/Software-Updates/wifi-problem-after-4-3-update-on-xperia-z/td-p/490591
Sony doesnt care to even address the problem though. Dont bother with repairing your phone or your sw2 . We have done that , the problem still remains.