From a few quotes, it sounded like he just needed a change after 23 years in one place. Maybe more will come out as things proceed. He made sure to say he wasn't "retiring", just stepping down from coaching Notre Dame.
“I’ve had 23 years. It’s unbelievable. It’s been amazing, but I firmly believe down the road it needs to be somebody else,” Brey said. “(Notre Dame Athletic Director) Jack (Swarbrick) and I talked about it this last week and felt now is the time to kind of do that.”