According to my I-797 notice of action of 3/28/2016
Uscis received my application: 3/24/2016
Priority date: 3/23//2016
Bios: 4/26/2016
EAD xp: 8/17/2016
The only theory worth much is the multiple batches, with flagged cases,
Hopefully I'll get some news these days
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Sent: 8/17/12: G-1145 text: 8/24/12: Biometrics: 9/12/12 Approved: 9/18/2012
Renewal sent: 6/6/14: G-1145 text: 6/12/14 Biometrics: 6/24/14 Approved: 8/18/2014
Renewal sent: 3/17/16: G-1145 text: 3/28/16 Biometrics : 4/26/16 Approved: 9/14/2016