I've noticed that the Droid seems to restart if moved quickly. One day I had to run to catch a bus and when I got on the bus, it was in the process of restarting. Just now, I picked it up and due to my currently sprained wrist I accidentally dropped it on my luckily carpeted floor. No damage, but it restarted.
Is this common? Is this a safety feature? I think Macs have something similar to it.