Hi.
I know the process is very frustrating. Probably CIC will be transferring your file to another visa office before the sponsor approval. In my case my AOR 1 was from Sydney office then it got transferred to Missausaga for further processing. I heard that depending on the application complexity they might send it to the local visa office of the PA for further processing. Hope this helps. . All the best.
June 11- App. Received
June 29- AOR1
Aug 17 - Sponsor approved
Aug 29- File transfer to Missausaga
My timeline is the same as yours, when did you receive medical? After medical of my husband the process just stopped, I don't know what's going on, the last email I received from Sydney that says file transferred to Mississauga, after that nothing! I'm getting worried now, the background checks hasn't even started yet