Strange error while processing files

Hi,

Recently I made a very simple workflow configuration just to test different versions of some templates for performance (only a capture folder → all in one → send to folder process).
I noticed that when dropping multiple files for processing, a random file gets the error:
W3001 : Error while executing plugin: HTTP/1.1 500 Internal Server Error - An unspecified error occurred which was caused by LoggedApplicationException: There was an error running the content creation process caused by null (SRV000001)
All in One: W1603 : Plugin failed - 11:50:06 (elapsed time: 00:00:00.178)

Now, after several rounds of testing, I noticed that everytime the file which gets the error is the 5th one starting from the end. So, for example, if I have 10 files, the file with nr. 6 gets the error. If I have 15 files, the file with nr. 11 gets the error and so on.
If I try to process these files separately, they get through without any problem, so the problem is not at the files, but something weird that planet press is doing.

Anyone had this problem before? Is there a solution for it?
Thanks in advance

To help you properly we would need to see the Template and reproduce the issue. I suggest you open a technical support ticket through our website.