@ddljohn-- The same has happened to me too. I think that risk is always there when there are connecting flights.
What I hate the most about connecting flights is when I have to run to the other end of the airport for my connecting flight. That's no fun! I also don't like having to switch over to different terminals to find my flight. I think it always happens in Chicago and many other international airports because the domestic flights fly out of one terminal and international flights through another.
That's fine, but it can be a hassle when you're trying to get to your connecting flight on time and you just had a 12 hour plane journey. Oh, and not to mention having to go through customs and security checks in the process.