I expired on 8/17 and just called USCIS to inquire about my case again. The agent said she couldn't submit a service request for my case because it was not "outside of normal processing times."

She said the message that came up when she tried to submit the request was that they were currently working on cases received on April 2. I sent mine in on April 6, so I hope I can hear some good news in a couple days.