Hi,
Monitor on *** for 'Website www.linuxinvent.info' has detected that the service has gone down at 29/Nov/2008 12:40
I get this mail so often.
What's the problem/error?

Thanks

If you don't think the service actually went down, it may be a false positive.

For example, if the system load was high enough at the time of the test, it's possible Apache took too long to respond.

What I'd suggest is to try increasing the timeout for the status monitor, that will probably prevent those emails.
-Eric