I appreciate your endeavor here. But only telling the symptom may not really help.
For example, we may never know if the issue you hit is only on some specific usb disk or not. Maybe it is happened to one brand but it won’t happen on another brand. I’ve seen lots of cases happened like that before.
It is only the uart log that can tell what is going on. To be more specific, if that is kernel panic, then only uart can print the driver stack dump in time. If you just reboot the device, that log would be gone.