This could be due to large influx of applications right at the beginning of year (July 1 2011), reduced cap limits (500) initiating rush for 1122 & 3152 (500*2= 1000 applications).
From the tracker you can see the files reaching on July 4 (actual first day of the current year ) were charged in 16/17 days. So that indicates they started working on this year files quite promptly. Thereafter the charging time is gradually climbing up and files received in August still are unopened.
Last year it was just the opposite , with new requirements like sending complete documents, cap system, new list of eligible occupations, so early July files waited 2 months before being charged while files of Oct/Nov (like yours ) saw it happening quite quickly.