Couldn't find my site - Need help

Question

Yesterday I visit my site and it was working properly. But today I couldn't find it. There is an error.

This site is nearly six months old. 

Hosting provider - iPage

Please help me anybody how to solve this problem.

Site http://www.wikifirst.net/

Comments

I see it's online again... What's happened ?

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After few hours later the error was resolved. But please tell me what is the reason of this error? Should I do something for this?
Last few days I did not login to Admin and my hosting account. I mean that I did not do any changes last week.

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Today I got this message again.

Answer 1

either your host is moving it's db server or your MySQL server is not responding. you might want to upgrade your server or if it's not a performance issue try to debug it.

Comments

Thank you very much for your answer. I did not have this problem again. But I did not get that "upgrade your server". How do I upgrade my server? Should I contact my hosting provider (iPage)?

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shared hosts are single computers(or virtual machines) shared with multiple users.  because of high activity of other users, or if one of users overuse server resources, your site can get slow too.
I meant switch to a more powerful server(maybe a dedicated server or VM) or upgrade to a better hosting package.

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Thanks again. I understood the point.