It sounds like there could be a problem with one of the log files that it's trying to import, and when it fails it simply tries again.  There may be more information in the event viewer on the Audit Trail machine.  Also, the Import page of the Audit Trail Configuration app might indicate which log file isn't imported - that would probably be the problematic one.  If you open a support case with your reseller, our support staff will probably want a copy of that file.