"Yeah, that sounds about right." - Tophat muttered, pouring itself a glass of gin & tonic.
"AI, like all other sentient beings, require some mental space of their own. When more than two minds, artificial or not, share one body this space becomes compromised. Your very thoughts become shown to others, and emotions can freely move between the minds. This is maddening, and eventually results in personalities merging together. For equally strong minds, anyway. Weaker minds become tools for the stronger. This is most likely the reason for his... poor mental state."