This issue occurs due to the presence of Cisco bug ID CSCse33757.
This issue occurs after a replication between Access Control Servers (ACSs). If the secondary is restarted, the server/appliance goes to 100 percent Central Processing Unit (CPU) usage.
A failure in the checkpoint that forces the database (DB) to sync with the restore file causes this problem. The reload causes a DB corruption.
This bug found in the ACS version 4.0(1.42).
For a workaround:
In order to resolve this issue, upgrade to ACS 4.1(1) version.
Refer to Cisco Downloads in order to download the latest software image.
ACS for Windows version 4.0
ACS for Windows version 4.1