Fix pagination on custom post type archive page

pagination_archive_fix.php

//==============================================================================
// SORT OUT PAGINATION ON ARCHIVE
// This fixes the canonical link on custom post type archive pages
// Odd WordPress bug that only occurs on archives
//==============================================================================

add_filter('redirect_canonical', 'custom_disable_redirect_canonical');
function custom_disable_redirect_canonical($redirect_url)
{
    global $post;
    $ptype = get_post_type($post);
    if ($ptype == '***your post type slug***' && is_archive()) {
        $redirect_url = false;
    }

    return $redirect_url;
}