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I had something similar happen with my First Progress card. I've never paid them late or tried to make any large payments or traveled with the card, but they froze it for some reason--I can't remember the exact reason they gave, but I called them and they fixed it. It only happened one time, and I've had the card for 10 months now without any other issues. Their website is not great, that's for sure. I always pay it off before the statement, so I get a $0 balance each month, so I don't think that's the problem. I recommend calling them very soon.
Did they give a reason for this happening?
I didn't speak with them because I have 3 times previously and it is painful. I bet their excuse would be something like it's Sunday and we couldn't manually approve the charge so we freezes up all the funds until the next business day. That sounds like what their response would be.