Does the Spirit come and go? My personal experience suggests that he/she does.
Instance: years ago as a pastor I went to a conclave of fellow pastors. There was much deep sharing, and I was on the very mountain top.
The weekend over, I returned to my parish to find a man I had labored with intensely for some months had broken over and became as drunk as a lord. All my poise left me; I made the same mistakes that people tend to do in such circumstances. I felt like the Spirit had left me.
Is that what happened? or did I leave the Spirit. These first Christians must have (to some degree left the Spirit after Pentecost, because we read that once again they were filled with the Spirit.
This may not describe the life of most people, but it sure does mine. For moments, now and then….