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Re: Bluetooth Headset Button S Voice Replaced by Google Now - Reenable S Voice
I ran into the same thing, and it seems to have been caused by an update to Google Search. See this thread I started on this, where I document other problems with Bluetooth performance after this update:
Flaky Bluetooth Headset Behavior since KitKat
The solution seems to be to go to Settings...Application Manager... and remove the recent update. You then either have to deactivate Auto-Update for this App, done through the Play Store, using the Soft Menu button, or to completely turn off Google Search in Application Manager.
I did the latter, and the only unwelcome change is the loss of the Microphone input key from my keyboard (for example to text without typing). I may turn it back on, and prevent the Auto-Update if this becomes too much of a problem (which it really isn't right now).
Hope this helps.