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The situations where it does not autorotate are those that do not support it.While in lockscreen,it should not autorotate and when a call arrives it is the same.
Sell a docking station that does not support rotating screen 100%,
Or developers are lazy and do not want to make it to work at 100% screen rotation
I am sorry,but sometimes it is related to an app to support that.Contact xperia care:
http://www.sonymobile.com/global-en/support/contact-us/