SBS Server 2008 Intermittantly cannot be accessed by computers on the network.

This is a small SBS 2008 network which has been experiencing intermittent problems accessing the server. When the problem is occurring the server can be "pinged" from other computers but Outlook will not connect to the Exchange Server (which is running on the server) and files cannot be accessed. I can connect remotely using RDP. After a period of time the problem resolves itself but will recur several days or weeks later. When the problem is occurring the system logs show a problem with what I think is the USB drive used for the backup (using native Windows backup) e.g. it reports an error on Drive  \device\harddisk\DR7 and "System failed to flush data to the transaction log. These errors seem to occur at about midnight and repeat over several hours. I would like to find out if others have experienced this sort of problem and if it is possible that a faulty USB External drive could cause this sort of problem with the server.

Thanks

John
jhswinsonAsked:
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WayneATaylorCommented:
I'd suggest making sure that you have all updated hardware drivers for the Server, especially look at USB and Chipset drivers etc
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jhswinsonAuthor Commented:
I disconnected the USB backup drive for a couple of days but the problem recurred and this time there were no entries in the System Event Logs to indicate any problems. The server itself does not appear to slow down and if I access it remotely using RDP I can access all the files and it is running at a normal speed. The PCs that are accessing the server can "ping" the server OK whilst the problem is occurring. I am at a loss now as to what to check and as always with intermittent problems  most of the time the server is running OK so it is hare to diagnose problems when they are not occurring

Any help or suggestions would be welcome

John
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jhswinsonAuthor Commented:
Reasonable advice but didn't really help solve the problem
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