As requested by the mod - opening new discussion for the issue. The Flashing Full Ramdump happened to me too - the phone was being charged over the night and the error was waiting when I woke up. I hope that at least your service will fix it quickly.
next ... Asus will close this topic in a moment so as not to write badly about the Z8. you have to use the guarantee, I will try to recover the money, unless I find out from Asus that they know the topic and that the new motherboards are free from defects. Zenfon 8 theme stinks more and more!