PhpSpreadsheet failed

I am doing an excel amount to the database, everything was working correctly and from time to time I get error 500. Doing tests seems that the reader.load is failing but I do not know how to solve it.

require_once 'phpoffice/vendor/autoload.php';

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Reader\Csv;
use PhpOffice\PhpSpreadsheet\Reader\Xlsx;

$file_mimes = array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel', 'text/plain', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');

if(isset($_FILES['file']['name']) && in_array($_FILES['file']['type'], $file_mimes)) {

    $arr_file = explode('.', $_FILES['file']['name']);
    $extension = end($arr_file);

    if('csv' == $extension) {
        $reader = new \PhpOffice\PhpSpreadsheet\Reader\Csv();
    } else {
        $reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
    }

    $spreadsheet = $reader->load($_FILES['file']['tmp_name']);

    $sheetData = $spreadsheet->getActiveSheet()->toArray();
    print_r($sheetData);
}