im also facing the same problem , the dropdown and one portion(entire right side of teh screen - around 2 mm in width) of the screen was not responding since the update and from today all the three home buttons also ar not responding. I am a die hard fan of sony fones and have been using Xeperia Sola and Xperia z1 compact before the current fone. I too have noticed the phones' response to a software update, especially after the fone becomes one year old. My Sola had a battery issue after a software update 16 months after its purchase and the Z1 lasted just 14 months. And now the present fone is in its 17th month - software update was done and now the fone suddenly starts to malfunction. sony, please fix these issues else you are compelling loyal supporters like myselves to change the brand which i really doesnt want to do.
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