why did it do that? Unresponsive and unprotected seems like a pretty poor state for it to default to.
Do you mean why did it freeze? I am not certain why the error occurred. It looks like the panel was slow to report the pending alarm and it was processing an automation rule at that time.
What is your power cable gauge and length? I would recommend updating to the latest firmware version to ensure all the latest bug fixes/patches are on the system.
If you mean why did it boot up in the state you saw, it looks like you had sent a bunch of disarm remote commands, most timed out but the last two hit the panel as soon as it booted up and connected, so the panel likely got disarmed immediately.