Hi,
Can you please check the account lockout policy for the users whose accounts are being locked out. Check each and every item in GPO object which might cause the issue regarding account lock out. Please find the below link for more details.
https://technet.microsoft.com/en-us/library/cc781491(v=ws.10).aspx
Or you can find the reason through lockoutstatus.exe tool. Download the tool from the below location.
https://www.microsoft.com/en-in/download/details.aspx?id=15201.
https://technet.microsoft.com/en-us/library/cc738772(v=ws.10).aspx use this link to find out the root cause of the issue.
There is no connection between disable a account and account lock out. Please find the below link for more details.
http://www.windows-active-directory.com/difference-between-disabled-expired-and-locked-account.html
Thanks,
Arindam
