Meltdown. The Sony Xperia Z3+ appears to be a small update of its predecessor. You might think that this should not be a big challenge, but the temperature development is a real problem and can also limit the usability of the smartphone in some cases.
http://www.notebookcheck.net/Sony-Xperia-Z3-Plus-Smartphone-Review.146123.0.html
Another product affected by the snapdragon 810.
I am unsure whether is the cpu or the software that runs on top of android that cause this cos the z4 tablet has the same problem.
I would drastically reduce the rating though as 84% is high for a phone that dims the screen when you go outside. This defeats the purpose of having something portable.