Drop in Google search results

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Anyone noticed unexpected drop in Google search results?  I have been in the
top 10 on all major key terms for years.  I am now in the 50-60's on the
same key terms this morning.  I have recently changed the hosting service,
everything else remains the same.  I don't think changing the host can
trigger this decline.  By the way, this host provides home for some adult
websites as well.  If an innocent site (like mine) shares a server with "bad
guys", can it possibly affect my standing with Goodge?  Please speak up.

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