Error failed multiples times off and on past couple months

[nspooney1]

[ERROR] Exception: unknown_error: retry your request
Traceback (most recent call last):
  File "/var/task/sfRealTimeQueueMetrics.py", line 89, in lambda_handler
    raise e
  File "/var/task/sfRealTimeQueueMetrics.py", line 86, in lambda_handler
    ac_queue_metrics(queue_id_name_dict,queue_ids,instance_id)
  File "/var/task/sfRealTimeQueueMetrics.py", line 219, in ac_queue_metrics
    raise e
  File "/var/task/sfRealTimeQueueMetrics.py", line 151, in ac_queue_metrics
    sf.sign_in()
  File "/var/task/salesforce.py", line 63, in sign_in
    resp = [self.request.post](http://self.request.post/)(url=self.login_host+"/services/oauth2/token", params=self.auth_data, headers=headers)
  File "/var/task/salesforce.py", line 176, in post
    return __check_resp__(r)
  File "/var/task/salesforce.py", line 204, in __check_resp__
    raise Exception(msg)