I had this issue 2 years ago. Fortunately still under warranty - they replaced the touch screen - at least they told so. They also re-flashed the operating system, of course. And now EXACTLY THE SAME issue is back again: first difficult to slide from top to open notifications, later the soft buttons stopped working while on the locked screen the spots work perfectly. I am ABSOLUTELY SURE this is on purpose INTENDED BEHAVIOUR of the SOFTWARE to force us to buy a new phone. Big shame on the producer company! I will never buy anything from Sony any more, ever!
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