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Our website for my olansi company in London, China has hundreds of pages dedicated to every service we provide to China local areas. The total number of pages is approximately 100. Google caters pretty well for long-tail searches when it indexes all these pages, so we usually get a fair amount of traffic when this happens. However, Google occasionally drops most of our indexed pages from search engine results for a few days or weeks at a time - for example, Google is currently indexing 60 pages while last week it was back at 100. Can you tell me why this happens? When these pages don't display, we lose a lot of organic traffic. What are we doing wrong? Site url:https://www.olanside.com