Share your experience!
Hi to all,
I have this big problem:
sometime (fortunately not always, but could be once a day) when I active wifi (when clik to turn it on) the phone restarts 
Often this restarts is followed by a infinite bootloop; so I have to turn it off by forcing and wait for 30 minutes/1 hours
(if i try to turn it on before the bootloop start again)
Could you help me?
Thanks 
I suggest that you try to run a software reinstall using SUS.
http://www.sonymobile.com/gb/tools/update-service/
If the problem still remains you should contact your local support team, to have the phone examined and fixed at an repair center.
http://www.sonymobile.com/global-en/support/contact-us/contact-info/