Firmware updates for the Sony Xperia Z3+ and Xperia Z4 Tablet could be related to overheating issue
Dual SIM version of the Sony Xperia Z3+ receives a firmware update
In the U.K. only, the phone is receiving a pair of firmware updates (28.0.A.7.24 and 28.0.A.7.27) even though the Xperia Z3+ has not yet been released in the region. While Sony did not publish a changelist for either firmware version, it did say the other day that it was going to send out an update to help the Xperia Z3+ deal with the overheating issues that have plagued it. The unit is powered by the Snapdragon 810 SoC, which is known to have problems with thermal regulation.
Besides the phone, the Xperia Z4 Tablet (SGP771) is also receiving firmware version 28.0.A.7.24 in both Hong Kong and Taiwan. The slate also features the Snapdragon 810 chipset under the hood, which keeps alive the notion that the firmware update is being sent out in order to help keep the affected devices from becoming too hot to handle.
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source: ePrice (translated) via XperiaBlog