Hi, Long time reader, but my first post here. I've been running a site since May and have had some initial traction with SEO, but I'm seeing a very strange pattern. Shortly after launch, we saw a rapid uptake in organic traffic until it suddenly dropped to nothing overnight. Then, after a couple of weeks, it returned and stayed for a couple of weeks before dropping again. This has repeated a couple of times, the last "up period" ended yesterday. The first few times around I found some errors that may have contributed to bad rankings, but I can't see anything wrong this time around. Also - and this may be purely coincidental - both this and the previous "up period" was exactly 21 days. This is our site traffic as it appears in GA: Has anyone seen a similar pattern before and do you have any idea about what may be the cause? I should add that we've done all the seo-101 and then some. The site performs well, has good on-page seo etc. We are an aggregator/search engine, so while I don't consider it spammy, we're probably in a grey area from Google's perspective.