To overcome it seeing your phrase and using it more, try to convey the concept you want it to say "found an indication suggesting there may be a problem underneath" in response to. That works better than telling it to do not use terms you remind it of.

Btw, you're in good company…

With both OpenAI and Anthropic, from time to time you see it stream a response to you that then changes and rewrites under your very eyes.

Those are things they, themselves, where they sit in the token supply chain, can't get it to not say until it's said it.