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There have been a couple of reports of yolasite sub-domains disappearing from the Google radar. This is quite difficult to analyse the reasons why. Sites go out of the apparent index regularly and generally the best way to fix this is to keep adding fresh original material on a fairly regular basis.
I guess no-one has a crystal ball to predict if a site will go or remain in the high parts of the SERPS at any one time. It does seem that your chances are improved with a custom domain and all else being equal. At the same time you do need to have a good content for your site for it to be presented in the SERPS.