This problem has been observed twice over a 7 hour period, ,varying the 
playlists 2/3 times per hour.

Whilst trying to create playlists by adding several albums at a time (and with 
the Squeeze Box playing), I have observed that the squeeze box stops and 
displays that it is no longer talking to the server, the Web-Interface reports 
that there is no page to display.

The folowing entry was observed in the Application section of the event viewer:

The description for Event ID ( 0 ) in Source ( Application ) cannot be found. 
The local computer may not have the necessary registry information or message 
DLL files to display messages from a remote computer. You may be able to use 
the /AUXSOURCE= flag to retrieve this description; see Help and Support for 
details. The following information is part of the event: Can't use an 
undefined value as a symbol reference at /PerlApp/Slim/Networking/Select.pm 
line 162.
.

The problem can be worked around by re-starting the slim server