Geneally RFE may be requested if the initial documents ted were incomplete. such as lack of I693, Birth certificate, all kinds of things.
If a I-485 is not processed for a period of time, RFE may be issued to check whether the applicant is still maintaining the same employment status,etc.
Reporting change of address triggers a RFE is likely a speculation. However, some unluky ones may get it because it is USCIS.