Tatiana, somehow that doesn't sound natural. Does this mean something like "you stop trying to improve your job performance"?

Yes, it does. I had "perform" in mind as i was thinking this over but went with what i posted. ;(

That happens to the best of us))

Am I to delete it?

I would say “when you’re in a bad mood, your job performance suffers.”

Why not add YOUR translation? ;)

👍