What Happens When Autopilot Software Crashes While You're Driving

Tesla autopilot suddenly turned off while driving. Possibly due to a crash and reboot of the autopilot software? This was with software v9 2018.50.6 Tesla Model 3, AP 2.5

The system suddenly disengaged and turn the hazard lights on, and came to a stop. An error message said "cruise not available." For 2-3 minutes I was unable to engage autopilot and no surrounding vehicles were displayed by the media control unit. However, faint lane lines were still shown. After 2-3 minutes autopilot came back on as normal.

According to @greentheonly, this is due to autopilot rebooting

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