I need help understanding a ws32time error and an LSASVR error.

I've posted on this problem before and its yet to be solved.  I have a network that slows to a crawl at night and dies.

I've replaced routers.
I've reconfigured DNS
I've set all the computers to static IP and put the server IP in the hosts file.
I've had someone hook up a fluke to check network traffic.
We have surmounted most errors, but there are these two left:

Event Type: Warning
Event Source: LSASRV
Event Category: SPNEGO (Negotiator)
Event ID: 40960
Date:  4/9/2008
Time:  3:10:02 AM
User:  N/A
Computer: SERVER
Description:
The Security System detected an authentication error for the server ldap/ifl-server.israelfoulonllp.local.  The failure code from authentication protocol Kerberos was "There are currently no logon servers available to service the logon request.
 (0xc000005e)".
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 5e 00 00 c0               ^..À    
 
Event Type: Warning
Event Source: W32Time
Event Category: None
Event ID: 12
Date:  4/9/2008
Time:  3:09:49 AM
User:  N/A
Computer: SERVER
Description:
Time Provider NtpClient: This machine is configured to use the domain hierarchy to determine its time source, but it is the PDC emulator for the domain at the root of the forest, so there is no machine above it in the domain hierarchy to use as a time source.  It is recommended that you either configure a reliable time service in the root domain, or manually configure the PDC to synchronize with an external time source.  Otherwise, this machine will  function as the authoritative time source in the domain hierarchy.  If an external  time source is not configured or used for this computer, you may choose to disable  the NtpClient.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.