I only recently got more than 50 reputation points. A recent question was put on hold as too broad. The next time I clicked the Ask button, I was given an automatic warning about asking another question. I don't want to have a drop in rep. Please explain the automatic warning message.
Your answer is in your question: your last question was put on hold. If you go to ask a new question without first remedying the problem that afflicts your last one, you'll see a warning.
If you can't fix your past questions, so be it - the system can be forgiving, to a point. But if all your questions are closed, you'll eventually be restricted when you try to ask more. The point at which that happens is > 1 and < 490 closed or downvoted questions.