Recently two players told me they had broken Artificer pets. By 'broken' I mean not just having them go brain-dead within a session, but permanently. The story that was conveyed to me was that in all subsequent play sessions, the pets would be summoned, set to aggressive and the pets would stand there and not respond.
Obviously this isn't good. If you have a pet in this condition, please let me know your server and character name (either posting here in this thread or by PM) so we can investigate.