Same problem.l use the phone for email and pictures. A while ago l noticed problems with the screen,when l took the phone out of its protection, the back part was almost completely detached(unglued) so l pushed a bit toreattach, it felt like some parts are bent inside. Rebooting will fix the screen temporarily until the screen turns automatically off after 30 minutes. Unfortunately, I wasn't aware the manufacturing guarantee expired. Repairs are expensive. I am sure is a manufacturing problem.Sony product quality declined after 2010. I will not buy another Sony.