WiFi connection problems

[sanjaya92]

after upadating of 4.3 i have lost my wifi connection even it cannot be on the feature. but i found when bluetooth is on i can swith on wifi but suddenly it closed what should i do now. do  i want to downgrade plz tell me

[Hampus]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

Do you experience the same behaviour if you boot your phone into safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008

If yes, I suggest that you perform a software repair on your phone via PC Companion:
http://www.sonymobile.com/global-en/tools/pc-companion/

In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.

Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.

[sanjaya92]

i accesed to safe mode but it didn't work. if i repair will it be worked?? 

[Hampus]

If the problem is related to a software issue, then a software repair will help. But if the issue remain after performing a software repair, I suggest that you visit nearest service center to have your phone examined by a technician. You can contact your local support team for further information about nearest service center and/or how to proceed with this in the best possible way:
http://support.sonymobile.com/global-en/contactUs/