Intermittent Curl error: Error (Sender) Curl error: Operation timed out after 0 milliseconds with 0 out of 0 bytes received

I've been intermittantly getting this error the past few days:

Fatal error: Uncaught exception 'Exception' with message 'Error (Sender) Curl error: Operation timed out after 0 milliseconds with 0 out of 0 bytes received,more=' in C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php:1013 Stack trace: #0 C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php(327): Thybag\SharePointAPI->onError(Object(SoapFault)) #1 C:\inetpub\wwwroot\sharepointAPI\src\Thybag\Service\QueryObjectService.php(174): Thybag\SharePointAPI->readListMeta('Quality Action ...', true) #2 C:\inetpub\wwwroot\tests\sharePoint.php(24): Thybag\Service\QueryObjectService->all_fields() #3 {main} thrown in C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php on line 1013

Is this something other people are seeing, or is it more likely to be something misconfigured on my end? I tried the below test code:

<?php
$xmlFile = "myXmlFile.xml";
$account = "myName@myCompany.com";
$password = "myPassword";

//Run as long as we need to, and show all errors
ini_set('max_execution_time', 30000);
ini_set('display_errors', 1); 
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

//Set up our sharepoint object
require "../sharepointAPI/SharePointAPI.php";
$sp = new Thybag\SharePointAPI($account,$password,$_SERVER['DOCUMENT_ROOT']."/".$xmlFile,'SPONLINE');

//Run a bunch of queries, and see if we get errors
for($i=0;$i<50;$i++) {
    $startTime = time();
    //I'm generating a new connection every time
    //Otherwise, the connection times out after about 20 runs through the loop
    $sp = new Thybag\SharePointAPI($account,$password,$_SERVER['DOCUMENT_ROOT']."/".$xmlFile,'SPONLINE');
    $sp->query("My List Name")->where("Title","=","Some string")->all_fields()->get();
    echo "<br>Test $i took ".(time()-$startTime)." seconds<br>";
}

The output I get from the above script is:

Test 0 took 1 seconds

Test 1 took 2 seconds

Test 2 took 8 seconds

Test 3 took 5 seconds

Test 4 took 2 seconds

Test 5 took 5 seconds

Test 6 took 2 seconds

Test 7 took 2 seconds

Test 8 took 1 seconds

Test 9 took 4 seconds

Test 10 took 1 seconds

Test 11 took 10 seconds

Test 12 took 2 seconds

Test 13 took 5 seconds

Test 14 took 10 seconds

Test 15 took 6 seconds

Test 16 took 1 seconds

Test 17 took 8 seconds

Test 18 took 5 seconds

Test 19 took 2 seconds

Test 20 took 5 seconds

Test 21 took 1 seconds

Test 22 took 6 seconds

Test 23 took 5 seconds

Test 24 took 1 seconds

Test 25 took 2 seconds

Test 26 took 2 seconds

Test 27 took 2 seconds

Test 28 took 4 seconds

Test 29 took 6 seconds

Test 30 took 4 seconds

Test 31 took 3 seconds

Test 32 took 1 seconds

Test 33 took 13 seconds

Test 34 took 5 seconds

Test 35 took 2 seconds

Test 36 took 2 seconds

Test 37 took 1 seconds

Test 38 took 5 seconds

Fatal error: Uncaught exception 'Exception' with message 'Error (Sender) Curl error: Operation timed out after 0 milliseconds with 0 out of 0 bytes received,more=' in C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php:1013 Stack trace: #0 C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php(327): Thybag\SharePointAPI->onError(Object(SoapFault)) #1 C:\inetpub\wwwroot\sharepointAPI\src\Thybag\Service\QueryObjectService.php(174): Thybag\SharePointAPI->readListMeta('Quality Action ...', true) #2 C:\inetpub\wwwroot\tests\sharePoint.php(24): Thybag\Service\QueryObjectService->all_fields() #3 {main} thrown in C:\inetpub\wwwroot\sharepointAPI\src\Thybag\SharePointAPI.php on line 1013

thybag / PHP-SharePoint-Lists-API

Intermittent Curl error: Error (Sender) Curl error: Operation timed out after 0 milliseconds with 0 out of 0 bytes received #113