I have this occur frequently during sessions of moderate length or longer iterating on code or data analysis. Once this happens, code cannot be executed, existing files are unavailable, new uploads either fail or, if the ui indicates successful upload, are still not available to ChatGPT to see or access. I have only seen it happen after also receiving an environment reset message, but that event on its own does not always result in this error. It happens in a few scenarios:
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During an active session where there are no significant gaps in time, after 20-30 exchanges this seems to become more and more likely.
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During any session in which files have been uploaded and/or code executed, followed by a gap in time of 30+ minutes or more, although longer gaps seem to result in this more often.
This does not happen in every session, but when it does there is no going back