Gemini 2.5 Flash error with PDFs

when using the new 2.5 Flash model (Pro works good), it often shows an error when giving PDF documents. I’m unsure if the context window is too long, or if it’s some other problem, it always shows a generic error message.

Any future messages after this error occurs also comes with an error message, so I have to either start a new chat, or switch to a different model for future messages.