A couple things to try so we can narrow this down:
Does this happen with a specific model, or does it also happen when you manually pick one like Claude Sonnet or GPT-4o instead of Auto?
Please run network diagnostics: Cursor Settings > Network > Run Diagnostics, then share the results here.
Are you using a VPN or a corporate proxy? If yes, try turning it off and see if the issue still happens.
Please also try turning off HTTP/2: App Settings Ctrl+, > search HTTP/2 > turn on Disable HTTP/2, then restart Cursor.
Since pasting the same prompt into a new chat works, it sounds like it could be a connection drop or something context-related in longer sessions. Let me know if any of this helps, or share a bit more detail.
It hasn’t happened again, but it was happening in new chats. It would just respond after thinking for a second with nothing. Then I copied the prompt and pasted it into the bottom of the chat instead of resubmitting the above (previous) prompt. This it would work. It only happened with Auto (several times in a row), and has not happened since, but I will try your solutions next time it happens, and also try different models.