error during upload file

[Sergio B.1]

I have an error with a file upload of ~452 MB this is the exception:

the code is picked from here

('64cb960257abb6a107b327cfefbad8ab', 502, u'\n\n\n\n\n\n\n
\n\n
\n
\n
Error (5xx)
Something went wrong. Don\'t worry, your files are still safe and the Dropboxers have been notified. Check out our Help Center and forums for help, or head back to home.\n
\n\n\n\n\n\n\n')

[Sergio B.1]

this is the code that generate the exception:

try:
    backup = open(BACKUP_DIR + '/' + backups_in_folder[-1], 'rb')
    file_size = os.path.getsize(BACKUP_DIR + '/' + backups_in_folder[-1])
    CHUNK_SIZE = 4 * 1024 * 1024
    dbx = dropbox.Dropbox(DROPBOX_UPLOAD_ACCESSKEY)
    if file_size <= CHUNK_SIZE:
        dbx.files_upload(backup, '/' + backups_in_folder[-1])
    else:
        upload_session_start_result = dbx.files_upload_session_start(backup.read(CHUNK_SIZE))
        cursor = files.UploadSessionCursor(session_id=upload_session_start_result.session_id, offset=backup.tell())
        commit = files.CommitInfo(path='/' + backups_in_folder[-1])

        while backup.tell() < file_size:
            if (file_size - backup.tell()) <= CHUNK_SIZE:
                dbx.files_upload_session_finish(backup.read(CHUNK_SIZE), cursor, commit)
            else:
                dbx.files_upload_session_append(backup.read(CHUNK_SIZE), cursor.session_id, cursor.offset)
                cursor.offset = backup.tell()

except Exception, e:
    print('* ERROR:' + str(e))

[Greg-DB]

Hi Sergio, is this happening on every API call, or only some of them? If it's only some of them, about what percent?