Hi all, in the missions that require DNA fixer, when built, I've never had a patient with this issue. Is this a bug or?

I know what you mean; in my experience the only time the DNA Fixer is used is when there's an emergency which requires it. I don't think it's used generally.

Weirdly, I often hear the announcer saying "handyman needed to repair DNA Fixer" or something to that effect, but I've never seen it get fixed, nor does it seem to require fixing, nor can you interact with it in order to check its state. I'm not sure what's going on there. I'm assuming it doesn't require fixing because it's only used once or twice per level.

DNA-fixer is an emergency-only-machine. No patients entering the hospital ever have the syndrome.
On a typical level, you get between one and five emergencies with this particular "disease".

On another note; It doesn't seem to require repairs, even though the receptionist keep yelling handyman to repair DNA-fixer whenever there's an earthquake.