There is a notorious hardware quirk with the Zenfone 8. The internal display ribbon cable sits close to the processor. When the phone heats up and expands, it slightly dislodges the cable, triggering a Ramdump.
Fortunately, there are several troubleshooting steps and fixes that can help resolve the RAM dump issue on the ASUS ZenFone 8. Here are some solutions to try: asus zenfone 8 ramdump fix