Hmmm... wondering if this issue has anything to do with it:
Australian Freight Terminal Operations 13 October 2011
The Transport Workers Union (TWU) has given notice of its intention to conduct further industrial action and hold two periods of two hour national work stoppages on Thursday 13 October 2011.
The TWU action covers Airports, Catering and Freight staff in Perth, Brisbane, Melbourne, and in Sydney at our Mail and Express Handling Terminals. This does not include staff at our main Sydney Terminal (SFT1) or at SFT2.
The stoppage is proposed for the following times:
• Sydney (excluding SFT1 and SFT2): 1st stoppage: 0600-0800hrs local time, 2nd stoppage: 1600-1800hrs local time
• Melbourne: 1st stoppage: 0700-0900hrs local time, 2nd stoppage: 1600-1800hrs local time
• Brisbane: 1st stoppage: 0800-1000hrs local time, 2nd stoppage: 1700-1900hrs local time
• Perth: 1st & 2nd stoppage (continuous): 1130-1530hrs local time