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.
According to ASUS Japan the root cause of the issue is a hardware defect. - h t t p s ://k-tai.watch.impress.co.jp/docs/news/1364953.html Google translate: "As a symptom, it seems that there are many reports that it restarts without user operation, a message such as "Waiting for flashing full ramdump" is displayed on the display, and it becomes unusable as it is. It seems that similar cases have appeared both in Japan and overseas, and a video capturing the situation has been posted on YouTube. According to the magazine's confirmation with ASUS JAPAN, the company is aware of this problem and says that it is a "symptom that appears in some products." The cause is a defect in some parts manufactured within a specific period, and details are currently under investigation. On the other hand, the model for Japan has different specifications from the model for overseas, so the defect rate is low."