Same issue here. Purchased new in September 2015 and this just recently started to happen. Top and bottom of screen. Still functional (swipes sometimes take a few tries) but slowly getting worse. The only other issue I've had with this phone is the camera lens--photos were becoming cloudy (this was at least a year ago). It turned out to be the coating on the lens degrading--removed it with alcohol and a Q-Tip and that fixed the problem. Sounds like I was lucky to get almost 3 years out of it. Was thinking about switching to a newer Xperia Compact but now I'm going to look at other options.
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