After using a mod that allowed me to set a new home for my companions (to keep them from going to the Lucky 38), Cass is always running off when I ask her to follow me.
After a while she returns. When I fast travel, it happens again every time.
When I tell her to wait, she'll actualy spawn at the door in each new cell I enter.

Does anyone have a clue what the issue might be? and more importantly, how to fix it?

Dismissing her and re-hiring doesn't seem to help.

Modlist? It's probably a conflict if you have old outdated or too many mods