Microsoft has just released the following KB Article:
SMS Agent Host service stops running when BitLocker is enabled on a System Center 2012 R2 Configuration Manager client
Symptoms:
The Systems Management Server (SMS) Agent Host service (Ccmexec.exe) process may stop running when BitLocker is enabled on a Microsoft System Center 2012 R2 Configuration Manager client. The client computer may also restart repeatedly.
Note This problem occurs when the following conditions are true:
- A program is distributed to the client.
- The After Running property is set to Configuration Manager restarts computer.
Full details at:
https://support.microsoft.com/en-us/kb/3037901