I know of several examples of ones that "left the truth" for up to 20 years, only to suffer through the reinstatement process and feel like they are finally back on track.
How does this happen?
The reasons people go back are varied I believe and no one can really know why a person returns but the person themselves. I returned at one point after having left for some time and may do again in the future for different reasons than I did the first time.