Not Found The requested URL /wp-admin/ was not found on this server

Hi,

I was working on my website when sudden changes occurs repeatedly.

Forbidden

You don’t have permission to access /cgi-bin/ on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

When I tried to access my wp-admin, following message was displayed:

Not Found

The requested URL /wp-admin/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I spoke to my hosting company and they said everything is fine from their side. Problem is it turns out to be ok half of the day and the other half it shows the error I mentioned above. Then again the other day it starts working fine and suddenly stops in middle. What is happening? Any idea/?

I am new to wordpress and do not have code level knowledge. Can anyone figure out what is the problem and the solution?

Thank you.