Many links from one source

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Have recently noticed a big drop in rankings. up to 50% for some key pages.

Trying to find out why. in webmastertools I have a total of 13000 links. I have noticed that 4000 come from one site to my home page. Keyword is not related and I have never heard of the site.

Not sure if I should just ignore these links or use disallow. If I disallow won't a sudden reduction in my links look strange to google?

I have read in this forum that negative SEO is very rare but I have no idea where these links have come from or what they are for.

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Thanks for your help Tommy

[TommyTan]

Hi Tim,

Since Disavow Link Tool is Google's Tool, it wouldn't look strange to them if you used it.  However, are you sure those links casued your ranking to drop or there are other reasons.  Many people always think that their ranks dropped is because of some bad links.  Sometimes there may be other reasons such as competitors doing better SEO, getting more quality backlinks, Google didn't find your contents helpful to search, you don't update frequently and etc.  Those are only examples.

Before using the Disavow Link Tool, you should make sure the links are the cause.  Furthermore, did you or the webmaster receive an unnatural link email from Google?  Did you get any notification from Webmasters Tool?  Note that if you removed the wrong links, it might further affect your ranking.  Disavow tool shouldn't be used lightly.

Hope this give you an idea whether you should use the disavow tool.  Maybe publish more useful contents targeting keywords or update more frequently?  Build more quality links?  These should get you back on the SERP.

Hope this helps.