This is why it's not the best idea to have your domain registration done by a 3rd party like your ISP/hosting company
Yes - live and learn! I'm really curious to know what's gone wrong - from the details OpenHost has given, it doesn't sound like overdue bills are the problem - but I don't really know. I would think though, that if your domain partner suddenly decides to redirect all your .com,.org and .net sites, then that's most of your hosting business knocked out!
The only other story I've heard is of a domain being disconnected by Enom at the direction of the American government due to a fraudulent website. That was a few years ago and nothing to do with Openhost though.