"I've never had trouble." It came easily, the words, but then he stops himself and thinks. Then shakes his head. "Actually, I lost control once. The first time I summoned Orpheus, Thanatos ripped himself out of him and absolutely destroyed the shadow that was attacking our dorm. After that though, nothing ever went wrong."

And he knows of other instances where Persona-users lost control of their Persona's. Such as Chidori and the there was Shinjiro...

"I think we're safe from losing control but better safe than sorry."