What is the MOST likely explanation for the lack of logs during frequent user account lockouts?

The most likely explanation for the lack of logs during frequent user account lockouts is log tampering or deletion. This scenario suggests that there may be malicious activity occurring, where an attacker intentionally modifies or removes log entries in order to hide their tracks. If logs are not being recorded, or if existing logs are modified or deleted, it can severely hinder the ability to investigate the cause of account lockouts and identify any potential security threats.

While network connection issues might lead to problems with logging events, they would not typically result in the absence of log records if the logging system is functioning properly. Similarly, user forgetfulness could lead to account lockouts but would not explain why the logs related to those lockouts are missing. Scheduled maintenance may interrupt logging, but it usually would not cause a complete lack of log entries for account lockouts. Thus, log tampering or deletion remains the most plausible explanation for the observed issue.