problem whit apache

[theprincy]

[/align]I have a server with 150 domain and all or most mornings I find myself locked apache is running but I have to restart to make sure that everything returns to normal.
In your opinion what could be? Some time ago I received a strange e-mail to a bug on the apache connections to unspecified but not finding anything in the network got trashed thinking of a fake.
Someone knows something about?