Box under heavy load

[Arubalisa]

Can someone explain from the info below what it means in English? Has been happening repeatedly this month and my frustration level is going higher. Any solutions, besides finding a new host?
box72.bluehost.com
2007-07-27 11:16:10: Box under heavy load -- you may experience degraded system performance
Services:
2007-07-27 11:16:10: An Administrator Is Investigating Performance On The Server.

[charlesgan]

11:16:10: An Administrator Is Investigating Performance On The Server.

should email this to support. To get their attention.
As at the error message is auto message.

lately i have to turn off the fastcgi, cause seeing few error 500.
basically its server problem. So need to forward the issue to them.

[memo06dic]

I'm having the same problem every wednesday at around 1pm central time

[areidmtm]

I'm having the same problem every wednesday at around 1pm central time

Have you contact support about this?