After an upgrade to Configuration Manager 2012 R2 Service Pack 1 (SP1) CU1, Configuration Manager clients are automatically upgraded to the SP1 client version.
This is a known issue in which the Configuration Manager Client Retry Task is created under Microsoft\Microsoft\Configuration Manager in Task Scheduler. After it's installed, the Configuration Manager client cannot delete the scheduled task that was created in this location. Therefore, the client is scheduled to be reinstalled every 5 hours.
To work around this issue, delete the scheduled task that is created under Microsoft\Microsoft\Configuration Manager in Task Scheduler.