Yes, it happened to my brother. He committed adultery but wasn't df'd, probably because the elders knew what a major bitch his wife was. He then proceeded to move out, file for divorce, and move in with a "worldly" woman, and still no df'ing. Then he met another "worldly" woman with whom he lived and eventually married. He still hasn't been df'd or even called for a jc despite the fact that his current address is on the divorce papers. But our mother, in her infinite self-serving jw smugness, refused to even see him.
What really cracks me up is that she asked my brother if his new wife wondered why he didn't have any family. Smart ass that he is, he asked our mom, "What makes you think I don't have any family?" She said, "Do you mean Jamie?" (yes, me the evil one who was df'd for making a false confession to adultery to get away from my dangerously abusive jw husband). And he said, "Yes, she's met Jamie."
The Watch Tower turns people evil! My mom cried the blues for years about losing her daughter, but the minute she had the chance to shun my brother, her only remaining child, she jumped on it like a rodeo bull rider.