The robots.txt file can make your site momentarily unavailable. If you have blocked any of your website's URLs, this may have an impact on your website, resulting in this error. So, before continuing, make sure you've tried all of the URLs in the robots.txt file.
Submit your website's sitemap once more.
Another explanation for the intermittently unreachable in Google webmaster can be a sitemap. The cause for this is that the sitemap was submitted in the incorrect format. So, before you start submitting sitemaps, make sure you test your sitemap and delete the previous one. Also, try to avoid putting a slash (/) in front of the URL.
If you have a WordPress site, you can use WordPress sitemap plugins like All in One Sitemap.For a more user-friendly search engine sitemap, use One SEO and Yoast SEO. If you have a dynamic website, you can use online tools like xml-sitemaps.com and xmlsitemapgenerator.org to manually construct a sitemap. These sitemap tools are well-known for their ability to create website sitemaps. After that, download the sitemap you've created.
