The Android 7.1.1 update for the Sony Xperia Z5, Z3+ and Z4 Tablet started rolling out towards the end of June this year, bringing new features and improvements. However, it looks like the update has some major issues for at least a few of its early adopters. Affected users say they are observing sluggish performance ever since the update was installed. Problems like high temperatures, crashes, and reboots have been reported. If you're also facing such problems on your device, you can try disabling the Movie Creator app, then booting into the Safe Mode (power menu -> press and hold...
Source: http://www.gsmarena.com/users_reporting_performance_issues_with_xperia_z5_android_711_update-news-26503.php
