Last friday I connected original charger with battery at 8%. I left zenfone unattended and, one hour after, it was bricked. No memory dump. Same behaviour, screen off, buttons no response, connected charger don't show led light. Completely bricked.
I have the Zenfone from June 26 and I have installed latest OTA.
Normally, I used steady charging and limitted to 80%.
Windows detect phone as Qualcomm HS-USB Diagnostic 900E, but nothing to do.
I remember the same issue with Google Nexus 7 manufactured by ASUS. No solution for it.
Sadly, I buy the Zenfone 8 in Aliexpress from China and I haven't warranty in my country (Spain). I buyed many other brands smartphones from China with any problems. When I discovered Zenfone 8, I thought it was the perfect smarphone for me. I trusted in ASUS as a qualiy brand. Now, I know I was wrong.
Even if Zenfone 8 could be repaired, there is no guarantee of bricking again.
ASUS must solve this problem and assume costs for every user, regardless where has purchased.
(Similar to Nvidia with his Shield tablets, when a problem with the battery caused Nvidia to replace all tablets affected by a new one)
I hope ASUS solve this issue as soon as possible and users can trust in ASUS as a top brand.