What potential issues can arise when using DOM object methods in PHP to manipulate XML files?

Potential issues that can arise when using DOM object methods in PHP to manipulate XML files include errors related to invalid XML syntax, incorrect node manipulation, and performance inefficiencies when working with large XML files. To solve these issues, it is important to validate the XML file before manipulation, handle errors properly, and optimize the code for better performance. 

// Load the XML file and validate its syntax
$xml = new DOMDocument();
$xml->load('file.xml');

// Validate the XML syntax
if (!$xml->validate()) {
    // Handle validation errors
    echo "Invalid XML syntax";
}

// Perform XML manipulation operations here
// Remember to handle errors and optimize performance

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