Windows 2003 R2 Enterprise SP2- File Share suddently no one can access. After reboot, it is back normal. Why?

Question

We have file server, which is using windows 2003 R2 Enterprise Edition, Service Pack 2. Today suddently no one can access its file share. I try to login to the server and open services, but it is so slow to respond. I have to reboot the machine. After the
server reboot, it is back normal. Any one know why?
Here are the system errors shown before the machine rebooted. First question, I am not sure which error really causes the problem. The machine is set to use WSUS to get windows update.  On the automatic updates, it is set to "Download updates
for me, but let me choose when to install them." Second question, why the machine is still trying to install update without permission? Please help. Thanks.
Event Type: Error
Event Source: Windows Update Agent
Event Category: Installation
Event ID: 20
Date:  12/13/2013
Time:  12:55:58 PM
User:  N/A
Computer: CHCDSSRV1
Description:
Installation Failure: Windows failed to install the following update with error 0xfffffbf8: Automatic Updates.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 57 69 6e 33 32 48 52 65   Win32HRe
0008: 73 75 6c 74 3d 30 78 66   sult=0xf
0010: 66 66 66 66 62 66 38 20   ffffbf8
0018: 55 70 64 61 74 65 49 44   UpdateID
0020: 3d 7b 44 36 37 36 36 31   ={D67661
0028: 45 42 2d 32 34 32 33 2d   EB-2423-
0030: 34 35 31 44 2d 42 46 35   451D-BF5
0038: 44 2d 31 33 31 39 39 45   D-13199E
0040: 33 37 44 46 32 38 7d 20   37DF28}
0048: 52 65 76 69 73 69 6f 6e   Revision
0050: 4e 75 6d 62 65 72 3d 30   Number=0
0058: 20 00                      .     
Event Type: Error
Event Source: W32Time
Event Category: None
Event ID: 46
Date:  12/13/2013
Time:  1:23:58 PM
User:  N/A
Computer: CHCDSSRV1
Description:
The time service encountered an error and was forced to shut down.  The error was: 0x800706BB: The RPC server is too busy to complete this operation.

Answer 1

Hi,
As you mentioned, users suddenly cannot access file share, the issue most likely caused by third party software, such as antivirus software. Please refer to the thread below to troubleshoot the issue:
File share become inaccessible
http://social.technet.microsoft.com/Forums/windowsserver/en-US/19205ea0-3efe-4c9c-a625-8ccf93744948/file-share-become-inaccessible?forum=winserverDS
For your second question, you can Configure Automatic Updates group policy and choose
Auto download and notify for install. This option automatically begins downloading updates and then notifies a logged-on administrative user prior to installing the updates
For more detailed information, please refer to the article below:
Configure Automatic Updates by Using Group Policy
http://technet.microsoft.com/en-us/library/cc720539(ws.10).aspx#WUS_ConfigureAutomaticUpdates
Please also refer to the article below to troubleshoot the error message:
The Windows Time service may generate event ID 7023 after you upgrade to Windows Server 2003 Service Pack 1
http://social.technet.microsoft.com/Forums/en-US/a86b4b3f-044a-499d-ba2f-d817931de6a0/windows-2003-r2-enterprise-sp2-file-share-suddently-no-one-can-access-after-reboot-it-is-back?forum=winserverfiles
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