Same here: xperia z3 compact. For a week or 2 now, home/drop down/back buttons don't work when in Portrait. Only if I turn the phone in Landscape position they work. But not all applications are working in Landscape. I have to open a new app and close all of them after. It is ridiculous. Repairisout of question: phone is out of warranty. Plus the Service guys will keep it at least 1 month, like the last time when the power button stoped working. If it's a software issue, please release a new update asap. My xperia z tablet has android 5.1.1 and kernel version: 3.4.0-perf-gbccb33a Fri Jul 10 (DOESN'T HAVE THE PROBLEM) Myxperia z3 compact phone has android 5.1.1 and kernel version: 3.4.0-perf-gbe52486 Sep 17 (HAS THE PROBLEM).
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