User account through all alerts are scheduled are frequently going to locked state

We have created a dedicated user account to schedule and run all ESS jobs and BI alert notifications. However, the account is frequently getting locked, causing scheduled processes and alerts to throw error. This requires manual intervention to unlock the account and restore the schedules.

Could you Please help in identifying the root cause of these recurring lockouts and recommend the necessary steps to prevent them.
It could be a great help.

Thank you!