I seem to have lost Professor Goodfeels from the co-op, but I don't think he got killed during a raid (and I haven't found any robo-corpse). I didn't send him off for maintenance using the terminal either.
Is it possible he just went walkies, and might come back?
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He is know to have the issue of disappearing for no reason when you leave the area fast traveling away and back causes it the most, pc users can re-enable him with console commands as he is usually still in the game he just de-spawned. Best way to keep him there is to just keep his settings at just be or deactivate him though he will sometimes still disappear. Its a bug that will probably be fixed with future patches.
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