Microsoft authentication package keeps locking account out

i have been having issue of accounts getting locked out once password changes. normal active directory accounts used login domain , onto exchange server. error seeing in our domain controller is:

authentication package: microsoft_authentication_package_v1_0

error code 0xc000006a  and  error code 0xc0000234

this particular user had not changed passwords in few years checked of mobile devices , computer have logged , still nothing. account gets locked out seconds after unlock account. have source workstation , have checked of services on it, , deleted exchange profile , re-created it. 

id start using account lock out tools try , find computer causing lockout. 

http://www.microsoft.com/en-gb/download/details.aspx?id=18465

use event comb grab event logs dc's, open event log in excel , filter computers - should see pattern showing lockouts source. 

then on computer make sure not have on computer / device running under users account - scheduled tasks etc. 

run full virus scan , malware scan make sure device clean. 

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regards,

denis cooper

mcitp ea - mct

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Windows Server  >  Directory Services