I've just seen errors similar to the following, several times in succession:
Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC SQL Server Driver]Communication link failure
/forum/show_forum.asp, line 20
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(The error and page referred to vary)
Are you using an ODBC connection to communicate between the website and the back-end database? If so, I would suggest switching to a direct connection string, as ODBC can cause problems, and reduce performance.
You might also want to check the physical connections between the server on which the website is hosted, and the one on which the database resides (if they're different servers; if not, you might want to consider making them different servers, because of the demands that SQL Server puts on the system).
Alex