Google will and can drop your website if the domain names expires. This is often the case when you forget to pay for the domain renewal. If your hosting or web development company sends you an invoice for “Renewal” pay attention to it.
Today we had a company call in asking why their website had “dissapeared”. We looked up who registered their domain and found that it was “suspended” as they had not paid their hosting company the renewal fee’s. As part of their terms and conditons they might have the clause to suspend services if they are not paid.
Note: If your website is “down”, many search engines will drop it from their listing. so all your hard work in SEO, link building, Web Marketing can go down the drain as Google could just drop you from No 1 on page one to last on Page 6.