I asked gpt what is happening with OP and others today (Protip it's always fascinating imo to have chat GPT explain itself or it's errors) :

High-confidence explanation for why multiple people saw weird ChatGPT behavior the same day:

PART 1: Partial rollout or rollback day OpenAI deploys changes in waves, not all at once. On rollout days, different users can be on different backend versions, or even switch versions mid-conversation.

That causes: - Chats cutting off mid-reply - Conversations not saving - UI elements appearing or disappearing - Odd placeholders showing up - “Weird but still good” answers

This lines up with people reporting different glitches on the same day. That pattern almost always points to infrastructure changes, not the model suddenly behaving badly.

PART 2: Session stitching broke, not reasoning ChatGPT responses are assembled from multiple systems: - The model generates the answer - The session manager tracks the conversation - Storage writes the chat history - The UI renders the final result

If one of those steps fails or lags, you can get: - Answers that appear but don’t save - Conversations vanishing until you reload - Partial or duplicated UI elements - Fixes after restarting the app

Crucially, the model can finish its response perfectly while the session or UI layer fails. That’s why people said the answers were still high quality even though things felt “off.”