It’s been 255 days since I last got a status update on my i130 petition

[BiniStar]

An RFE was sent on 10/09/2018 to my wife’s address but she never received so we requested for an address change on 11/08/2018 and on 11/13/2018 my Case History changed to Request for Evidence for your Form I-130, Petition for Alien Relative. Our Potomac Service Center office is working on your case again and on 11/15/2018 Request For Evidence that you did not receive, referral number SR13091805189YSC, was completed. Anyone with suggestion why it’s taking so long to get a definite answer would be warmly appreciated. Thank you