I’ve had a couple (maybe three or four) black screen and full reboot crashes like that. Not reproducable and infrequent enough that I didn’t consider to send it back. It hasn’t let me down when I was actually navigating. If I recall right these happened while connecting or disconnecting from a computer and on the bike but during initial startup when the screen just kind of stayed dim (faint logo). It’s been a while that this happened and I don’t recall exactly. I have taken multi day trips since and zero issues. Maybe an update fixed it?