It would be important to consider their reason/s for abandoning SFI and respond to that with a proactive solution.
If you do not ask what caused the affiliate to leave SFI then you will never get to understand him/her.
Ask what was the reason for drifting away and then inquire if he or she would come back if circumstances were different. Things can be different with a working plan or even discuss the solution immediately to gain their trust in SFI again.