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Well that is odd - Try an app preferences reset - Settings then tap the 3 dots then Reset app preferences
Does it work while on safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
I'll wait for Lolipop to do that.
The problem is with "OK Google settings"
Here are more users with the same problem
http://www.htcmania.com/showthread.php?t=994881
To make it work we have to disable "OK google detection on any screen"
so, I don't know ho have to solve it, Sony or Google.
So it's a google/android issue.