Credit scores can drop due to a variety of reasons, including late or missed payments, changes to your credit utilization rate, a change in your credit mix, closing older accounts (which may shorten your length of credit history overall), or applying for new credit accounts. And don’t forget that credit report inaccuracies due to mistakes or identity theft can also cause a dip.
https://www.creditkarma.com/advice/i/credit-score-drop
