If you can access the dashboard, go to settings and generate the debug log.
Or follow these instructions
http://community.umbrel.com/t/how-to-generate-debugging-logs/
Without logs to see what happen, we can’t help you diagnose.
But as far I saw, cases like these are because of hardware failure of your SSD: case, cable, drive or the power adapter that is not giving enough power.
So start there investigating.