I think RFE's are being issued for the following types of cases, as far as I could observe on this forum:
(1) Used AC21 and changed jobs
(2) Got FP'd more than once, and especially if the two FP's are in different locations
(3) Changed addresses and notified INS
(4) INS whim & fancy. ;-)
Number (4) is hopefully pretty low in percentage terms. I personally have been RFE'd but think it is because of number (3).
Regards
RD: Dec 06, 2001
FP: Apr 18, 2003
RFE: Feb 17, 2004