Has Grok gotten worse for storytelling?

So, I am using the free version to craft sequels to some stories I wrote years ago. Initially, Grok 3 really blew my mind with how fast it copied the voice (the prose style) of my two main POVs. Even after 20 chapters, it could still recall specific information from the first chapter and all the material it had trained on.

But now, it barely keeps track of a fifth or a quarter of that, simply ignoring most previous chapters (claiming I never provided them). At chapter 11 it's ignoring everything that came before chapter 7. When I return to chapter 7 and change the prompt, it recalls only chapters 4 to 7.

Have they reduced the context window? Because it definitely seems so.