什么可能导致“此页面有重定向循环”？

i added this script in a page whereby, it needs to redirect the page when the item is ought to be bought by the users

if($servertime >= $itemtime && $model->isActive()){
    header("Location: ". $redirectpage);
    exit();
}

the error only happens in the morning, i don't know what's causing the error, when i checked the error logs, i can only see a huge dump of yii that has this readable text saying

Unable to resolve request

any ideas ?