Many people trying to move higher up the ranking in searches related to their industry, simply fail to do so because they don’t know a basic rule.  Most websites that have a high ranking have unique I.P. addresses.  Using a shared hosting plan means that you would be using the same I.P. address with hundreds of other websites.  A single website  flagged as a bad site can lead to the fact that all websites using the same I.P. address will have their SERP’s affected.  A simple yet helpful solution to this would be switching from a shared hosting plan to having your own unique I.P..  Another factor that should not be neglected is the reliability of the hosting package.  Web crawlers or spiders like Yahoo Crawler visit websites to take snapshots or cache to update in their index.  If it happens that your site has technical problems related to hosting, such as being offline or not available, the “crawler” will not make an update, nor will it make a blank cache, which also affects your page’s positioning.  A common misconception is, if you bid higher on the keywords, you will also have a good ranking from the searching. This is a thing of the past and now it is also about the loading speed.  So even if your website might bid lower on the keywords it will do better on the rankings simply because your website loads fast.  To better cope with all these problems a full analysis of your current website hosting is definitive.  As a conclusion we can restate the common solutions:

Check your I.P.

Checking other websites that you’re  sharing the I.P. with

Checking the reliability of the web hosting company

Checking the loading speed.

This should give you a starting point in improving your website ranking and making the most out of SEO.