Customers can protect themselves from sudden bank account closures by ensuring that they comply with all the terms and conditions outlined in their account agreements. This includes avoiding any suspicious or fraudulent activities, maintaining a good standing with the bank, and promptly addressing any issues or concerns raised by the institution. Additionally, customers should regularly monitor their accounts for unusual transactions or patterns that could trigger security alerts. By staying informed about their financial activities and promptly responding to any inquiries from the bank, customers can reduce the risk of unexpected closures.