I am using access token to access dropbox API to `list_folder`, `download_file`, `downloadfile_zip`.
And the result is
1. https://api.dropboxapi.com/2/files/list_folder api can sometimes return the results, I tried 10 times, 2 times get the results, the other 8 times with the exact same request parameters will get 409 {"error_summary": "path/not_found/.", "error": {".tag": "path", "path": {".tag": "not_found"}}} error.
2. download_file and downloadfile_zip always return 409 error.
Is there any limitation for the API with the access token?