用python2.7调用阿里云“录音文件识别”webapi经常会出现403。

在根据官方提供API整体的校验规则 python2.7 Demo调用“录音文件识别”接口出现问题
有时候出现403 有时候调用成功。
难道对调用时间间隔有要求？ 还是其他原因？

{"id":"ba69238f17004a66b756c728ad97a21d","request_id":"ba69238f17004a66b756c728ad97a21d","error_code":80103,"error_message":"Get AK LTAINETq3RLTnLdZ Fails, AK XXXXXXXXXXXXXRequest UMM Fails, The Fails Code: 404
{"url":"/?accessKey=XXXXXXXXXXXX&serviceCode=nls&api=authCheck3&token=12e8a7067e5977038095df899f016712","headers":{"accept":"application/json","date":"Sat, 28 Apr 2018 02:26:22 GMT","content-type":"application/json","authorization":"Dataplus XXXXXXXXXX:96ZfsUWyjPyj8981dkBlLy+QW/c="},"method":"GET"}"}