Hi nancygator,
I am in the exact same position as yourself although my AOR was on August 29th. My application status is identical to yours with background check still to be started and also medicals that instructions will be sent if needed, although I did my medical upfront + "your action is required".
Quite frustrating.
Did you find out your visa office? Is it just you applying or is it yourself and a partner? Also, are you applying from your country of citizenship or from another country?
As I am applying from New Zealand and being a Belgian citizen I was thinking this is slowing down the whole process but it would be good to hear what your situation is?
Cheers!