National Australia Bank chief customer officer Andrew Hagger has been forced back in front of the YouTube camera again to apologise to customers for the bank's third outage in a week, reports Finextra. The bank's online and mobile systems once again went dark over the course of a two-hour period yesterday afternoon. The latest outage comes hard on the heels of a series of failures over the course of the past week. Some have pointed the finger at the bank's ongoing roll-over to a new core banking platform supplied by Oracle.