Most likely a slow leak. When freon is low quick cycling is typical. Your mechanic should have been able to detect a leak when he vacumed it down before charging and after he charged it. In fact he should have thoroughly tested for leaks, that is part of his job.
Whether he charges you or not is up to you to a great extent. If he was careless or not thorough and is unethical he will surely try to charge you. Ask a lot of questions and get the answers then decide if you should pay him more.
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David Hunter
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