What happened with ChatGPT Turbo 3.5 algorithms?

Just a month ago, I was creating excellent technical articles on a personally created prompt with a high probability of a predictable result. They were on average about 1.5 thousand words (I set this number of words in the prompt) and had a similar structure (set too).

Now I sometimes need to clarify and ask 5-10 times. He has stopped doing simple tasks or writes that he cannot do it. He also very often now creates short articles of 200-400 words. Tell me, perhaps something happened in the aglorythms during this time, but I don’t know?