Share your experience!
I was about to suggest safe mode, but then again, if your phone is locked to a carrier, it could be that they created this bug when they modified the software.
As you know Sony release the update and then carrier/networks modify/add bloatware, settings, etc and then release the update.
Thanks to all of you. Unfortunateley, none of the solutions has worked. I´m going to try taking it to some techical service. I´ll tell you if they give me any other solution.