@LVE did you try restarting your phone in safe mode? If you just bought your phone and received a lot of software updates you may want also to try first a software repair using Xperia Companion and if that doesn't help please contacy your Local support or even better, return the phone to the seller and ask for a replacement.
Yes. My statement says I did ALL the steps. A factory reset didn't work because it didn't go back to the previous version. It still used the updated software version. See if the retailer will replace it? Will Sony replace it?
