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I had that on a 510. Switched it on, did a bit of a ride then paused it. It shut itself down after a few mins of being paused and wouldn't come back on. Got home to find it had completely reset itself to factory (beeps switched back on etc) and had lost the ride. It's been ok since then, but had a couple of times where it's stuck on the initial Garmin screen and rebooting won't work. Plugging it into a charger got it out of that, but it already had mostly full battery.
TurtleRecall
Yep, battery was still over 70% when I woke it up with the reset.
It's the first time it's done this black screen gig and refused to turn on through normal means. Previously it has just turned itself off randomly, turned itself on again and lost the ride up to that point.