I'm a May 15 applicant and almost all applicants having similar time frame got approved for sponsorship.
They requested my father's death certificate but did not send me the email or letter. I figured that out by calling the call centre.
Sent them the document right away. After one month they told me they didn't accept that. I had to prepare another document.
And now I guess I'll be waiting for another month to hear from them.
In my past experiences with CIC, they're usually not that slow (FSW, Wife Sponsorship and Citizenship), but this time they seem to wait until deadline is reached to start processing the submitted supplemental documents.
Probably they're busy doing "easy" cases and putting aside those need extra care. I can understand that since the officers are all human so the only thing i can do is wait. I am already very lucky on my immigration journey so I don't really have complaint on my mother's progress. At least she can have more time preparing for her immigration as well.
There are lot of people from May 22- May 23 that are kind of stuck either at AOR or In process just after receiving AOR. I am wondering what is going on in there. But you are not the only one in this case. Keep an eye out.