Use the name of the looping process to classify the failure. If the looping process is a service execution process (SEP), the loop could either be in an enterprise server subsystem or in the application; look at the active trace dataset and the system trace table from the dump X dataset to determine which module last got control.
If the looping process is not a SEP, or the last module to get control was not part of the application, you should refer the problem to Micro Focus technical support.