dead xperia z3 Fix topic

i have xperia z3 D6603 unlocked bootloader.

i was talking on the phone with a friend when suddenly i couldn't hear him, i checked the phone, the phone was dead even though i had 80% of charge left.

i tried pressing volume and power button at the same time nothing happened.
i tried pressing the yellow button next to the sim card nothing happened.
i left it charging for 3 hours nothing happened.
i left it alone for 2 hours maybe it would work by itself but nothing happened.

so i was wondering what can i do ? i remembered that i have read somewhere about how to remove a password of a phone even if the phone is encrypted. this has no relation to the matter but what came to my mind is that, when they want to crack the password they have to put the phone in the freezer for 1 hour.

i have no solution left the phone was dead it doesn't connect to the pc, it doesn't power on, no vibration, nothing...
i put it in the freezer for 1 hour exactly. i went to check on it, i pressed the power button and voilaaa it turned on with ice all over the phone.

i entered twrp backup and made a restore of my previous backup. all went ok i restarted to system and after 1 minute it went black and dead again.

i said maybe the freezer didn't help maybe i should just leave it alone. i left it alone again and nothing happend for 2 hours.
i put it back in the freezer for 1 and a half hour, i added 30 minutes just to be sure.

when the time passed i went again to check and here it is powering on again. i left it in the freezer to fully power on.
i went to the computer and downloaded a stock kernel while the phone is still on in the freezer.
i went to the freezer and powered the phone down and took it to the computer and flashed the kernel.

after that i powered it on normally and it worked just fine, the only problem i had is that the battery wont get to 100% while charging it stops at 99%. i locked the bootloader using flashtool and used pc companion to restore it to the official firmware.

now the phone charges to 100% locked bootloader and works just fine like a new one. the battery seems to last longer as some people have said about putting the battery in the freezer for it to last longer. i think it does work after all.