All devices are tested before shipping but some issues will only appear after more extensive use. It will be the same for any manufacturer. Some models will have more or less issues than others. This is always the case and it applies to any kind of complicated electrical device. We understand your frustration but your ASUS Service center will surly help you out and in the end, we are confident that you will be happy with your ZenFone 6harig531 said:After updating new software after 1 day.it randomly restarted after that morning it will keep on the restart and asus log is coming again restart.i went to asus service enter they said motherboard issue mobile purchases 10 days ago.dear asus please respond what is you quality control team is doing before release the product into the market.