500 EsepCommand failed and no fallback available.

Hi, I'm trying to submit a payload to POST https://sandbox.esignlive.com/api/packages, in the past few days it has been intermittently working and not, this morning it hasn't been working at all yet. The error message is

{ messageKey: 'error.internal.default',
  technical: 'EsepCommand failed and no fallback available.',
  message: 'Unexpected error. We apologize for any inconvenience this may have caused you, please try again. If the problem persists, please contact our support team.',
  code: 500,
  name: 'Unhandled Server Error' }

I am uploading a pdf as part of the payload uncompressed it is around 8.6 mb, I don't think this is the issue as this has been working at this size for many months. Here are some of my upload parameters which haven't changed in months also

var options = { 
	method: 'POST',
	url: 'https://sandbox.esignlive.com/api/packages',
	headers: {  
		accept: 'application/json',
		authorization: 'Basic ' + config.esign.api_key,
		'content-type': 'multipart/form-data; boundary=---011000010111000001101001' 
	},
	formData: { 
		file: { 
			value: document, 
			options: { 
				filename: './' + pdfPath, contentType: null 
			}
		},
		"payload": JSON.stringify(signInfo) 
	} 
};

If you need more detail I can privately send the whole HTTP request payload. Is there anything new with the API spec? Is this error isolated to sandbox or will I see it in production aswell?