NTT DoCoMo has just launched the Xperia Z4, a.k.a. Xperia Z3+, the first in Japan to do so. Already, users are chiming in over the Internet to express their displeasure at their new smartphones being too hot to handle, literally. This practically confirms problems attributed to the Snapdragon 810 and could deal a devastating blow to both Qualcomm and Sony. Almost adding insult to injury, NTT DoCoMo itself carries a card warning users about heat problems, cementing issues facing Sony's suppsoed flagship and Qualcomm's beleaguered processor.