Sorry for the crash, but a video and only 2 details, that the battery still had 90% and you had a cutout at 79 km/h, leaves a lot of room for many scenarios. At the very least, personal fault cannot be ruled out. Not even with the statement that you have already riden 90 km/h before. Too many factors play a role.
It is well known that a wheel, regardless of manufacturer, can have a cutout due to overpower even without a warning. I don't know if you are aware of this? If not, I suspect I know the reason for your cutout/crash.