google bot have been half from past 3 days.

Google bot hits have dropped on my server

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Hello,

I would like to know, if any instance is been observed which happened to me.

Google bot was hitting my server with more than 100,000 hits everyday.

But from the past 3 days, its been around 50000-60000 hits.

What may be the cause and would it have any noticeable effect on my site?

I feel that my revenue (Traffic) too is down a bit 3 days from now.