Website Keeps Going Up and Down

[apricity]

My website keeps going up an down, like the server is being weird or something. What can we do to fix that?

 

[Dead-i]

Hi,

When you see your website as being offline, what error message do you receive?

Thank you,

 

[apricity]

Hi,

When you see your website as being offline, what error message do you receive?

Thank you,

It said "Domain document root not found"