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AS THIS MOBILE HAVE SNAPDRAGON 615 CHIPSET , I THINK THIS MOBILE HAVE HEATING ISSUE 
AS ALL THE MOBILE LAUNCHED HAVING SNAPDRAGON 615 CHIPSET HAVE HEATING ISSUE , EVEN AFTER 10 MIN.. OF CONTINUES BROWSING THE HEATING ISSUE EXISTS
EVEN THE XIAOMI MI4i LAUNCHED WITH 2ND GENERATION SNAPDRAGON 615 CHIPSET STILL HAVE SAME ISSUE
SO HOPE SONY WILL SOLVE THIS ISSUE SO THAT USER CAN USE HANDSET WITHOUT ANY PROBLEM
AND CAN ANYONE PLEASE TELL THAT EXACT RELEASE DATE THERE IS NO HELP WITH XPERIA CUSTOMER SUPPORT FOR THE RELEASE DATE
Mines been in for repair for overheating during phone calls since the 6th June. Infact it has been in so long I have since moved home!!
Seriously when I reported the problem the repair centre they acted like this was a one off fault they had never heard of before.
I am very unhappy with the product and service, I emailed in to let them know about my change of address yet got a message back relating to something entirely different.
I have now come to the conclusion it will either be returned unrepaired (as there doesn't seem to be a fix), it will be claim to be repaired but not, or it will be sent to my old address and lost.
The phone has a lot of issues, overheating, very poor battery life and it is constantly out of memory requiring file swaps. I feel very dissapointed as it appears to be a total loss in purchase terms even when it is suppose to be under warranty.
I feel I will have to explore other ways of recouping my money.
Warm is nothing. When my phone gets hot, I can't touch it with my ear. It's hot,not just warm. And by just playing sudoku! Hahaaa
I have this smartphone since november 2015 and it was running fast and i was just fine with it but after marshmallow update phone started to restarts on its own ,then after a week i had few blue screens of dead with no message, like în windows pc happens.
Bad news are that right now is always restarting after starting it ,several times, and good news are that after few restarts phone goes well but very slow with no crashes.
And trying to find out whats the problem with it i saw that phone doesnt detect all its ram 2 gb but only 890 mb. At least is not crashing anymore but it gets really hot 80 degrees and feels like cheap phone.
I wrote this here specially for Sony admins from forum so they inform about this.
Ram is the first problem of this phone not cpu.