I have a three year old Xperia Z1 and it has been working fine until recently. But now, the keyboard intermitently goes crazy - sometimes as if I'm pressing the wrong keys, others autocorrecting/adding words when I have only added one letter. I have tried a factory reset and have now switched off all the predictive text, dictionary options that might be causing the the problem. But it's still acting odd - the only way I can fix the keyboard is restarting the phone, which gets very annoying. I'm ready to ditch the phone and go back to Samsung - unless someone can help?