Maintenance for the week of September 1:
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• [IN PROGRESS] PlayStation®: NA and EU megaservers for patch maintenance – September 3, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
The pets tend to go passive when fighting something that either they can't reach, has phased, or teleported; not always, but these are the situations I've noticed. There's a boss in normal Crypt of Madness that teleports back to his starting spot once he gets to a certain point in his health, that teleport causes pets to go passive until you command them to attack again.