Firmware update 17.1.1.A.0.438 that was recently certified for both the Xperia Z2 and Xperia Z2 Tablet is now starting to roll out for the Xperia Z2. Sony appears to have updated the baseband of this firmware update and users are reporting better tap to wake response. We haven’t seen a wide launch of this build right now, so you may be waiting a little longer before it hits your region.
Via XDA-developers.
Thanks Rimas!