I've noticed that any time my phone takes a bump, it immediately reboots. For instance, I sat it on the edge of the sink this morning and it slid into the sink then immediately rebooted. If I toss it from a few inches onto a hard surface it will do the same. I even dropped it from taking it out of my pocket the other day but managed to stop it from hitting the carpet with my foot, yet it still rebooted. Note that I have never actually dropped the phone onto a hard surface from more than a few inches away.
Is this possibly a sign of a faulty droid or does the phone actually have some sort of shock sensor/damage protection built-in and this is normal?