Parsing WSDL error

Hi all,

Im using API's since last year and I've never understand why there are so many problems while starting a PHP script.

I get this error 2/3 times:

PHP Fatal error:  SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://adwords.google.com/api/adwords/cm/v201605/AdGroupCriterionService?wsdl' : failed to load external entity "https://adwords.google.com/api/adwords/cm/v201605/AdGroupCriterionService?wsdl"
 in /hd1/www/giorgio/src/Google/Api/Ads/Common/Lib/AdsSoapClient.php on line 169
PHP Fatal error:  Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://adwords.google.com/api/adwords/cm/v201605/AdGroupCriterionService?wsdl' : failed to load external entity "https://adwords.google.com/api/adwords/cm/v201605/AdGroupCriterionService?wsdl"
 in /hd1/www/giorgio/src/Google/Api/Ads/Common/Lib/AdsSoapClient.php:169
Stack trace:
#0 /hd1/www/giorgio/src/Google/Api/Ads/Common/Lib/AdsSoapClient.php(169): SoapClient->SoapClient('https://adwords...', Array)
#1 /hd1/www/giorgio/src/Google/Api/Ads/AdWords/Lib/AdWordsSoapClient.php(51): AdsSoapClient->__construct('https://adwords...', Array, Object(AdWordsUser), 'AdGroupCriterio...', 'https://adwords...')
#2 /hd1/www/giorgio/src/Google/Api/Ads/AdWords/v201605/AdGroupCriterionService.php(10389): AdWordsSoapClient->__construct('https://adwords...', Array, Object(AdWordsUser), 'AdGroupCriterio...', 'https://adwords...')
#3 /hd1/www/giorgio/src/Google/Api/Ads/Common/Lib/SoapClientFactory.php(166): AdGroupCriterionService->__construct('http in /hd1/www/giorgio/src/Google/Api/Ads/Common/Lib/AdsSoapClient.php on line 169

Can someone help me please? The problem is that the same script sometimes works for 24/48hours with no problem and sometimes this error appears after 3/4 minutes. What's wrong here?

Thanks a lot,

bye!

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