Random COM Instance threads utilizes all CPU thread

Hello,
We are struggling strange issue while using PDF Creator Terminal COM.
The system is Windows Server 2008 R2 and the newest PDF Creator Terminal.
Problem happens to PDF Save and Merge functions. I believe this happens to other functions too.
Here is the point for example:
There is ~20 iterations of saving PDF print job.
At random iterations the thread initiated by PDF Creator COM DLL perhaps fails and utilizes all CPU thread. This leads to CPU severe throttling...
You can find it's details on the screen. Please let me know if you need further details.