Odd behavior when exceeding SCO license count

We have a 30 user OpenServer license (5base+25).  One of our programs is written in RM COBOL and as part of the program logic, it writes a text file into a specific directory.  Once the data is written to the file, it is renamed with a specific extension so another program will "pick up" the file (to process it).  Over the last couple of days, the "rename" process is failing.  No error is given, it just never gets renamed and therefore doesn't get picked up by secondary program because it isn't named correctly (with the proper extension).  The ONLY pattern I can see when this happens is that our user count is above 30 users when it happens.  If I have someone log out to be 30 or below, the process works again because the file gets renamed.

I plan to purchase another 10 users, but want to make sure this "makes sense" because I hate to buy more licenses at this point IF the problem isn't associated with exceeding the license count.

COULD EXCEEDING THE LICENSE COUNT CAUSE THIS BEHAVIOR?  (Renaming a file failing)

Thanks