Beginning last night (12/2/23) I was working whit a custom GPT I created. I was typing a fairly long prompt, perhaps 400 words. I fired up another browser tab to check on something and when I returned to my GPT, the entire conversation had disappeared. As I had not submitted the prompt yes, there was no context. Nothing for the GPT to recall so I tried again. This time making sure to submit the initial prompt before looking at anything else. Ming you I am not leaving the chat, I am just in another browser tab checking something. Upon returning to my GPT, everything was gone. GPT had no recollection of the prompt I had submitted.
This morning I had the same experience with a custom GPT had made public. Ironically the GPT called Everything About GPT was the culprit. https://chat.openai.com/g/g-9ho7F6piB-everything-about-gpt