Time Machine crashes whenever the computer goes to sleep or into screen saver mode.

Apologies if there is an obvious answer or post about this. Every time I try to initialize Time Machine, it will begin backing up until the computer goes to sleep or the screen saver kicks in. When I wake the computer up, I get a message that says "The backup was not performed because an error occurred while copying files to the backup disk." The message also tells me that the problem might be temporary and to try Disk Utility to repair the backup disk if the problem persists.
When I run Disk Utility, I am told that the volume cannot be repaired and that it needs to be reformatted. I reformat the disk, try to run Time Machine again, and get the same problem whenever the computer goes to sleep or into screen saver mode. Lather, rinse, repeat.
I managed to get an initial backup only if I turned off the screen saver and the sleep function. However, once I turned them back on, I ran into the same problem when Time Machine tried to update the backup.
I am running OS X v.10.6.8 on an iMac5,1. The backup is a Toshiba 1TB USB external HD. I saw this same problem posted in the Lion forum (and I cribbed the title of this post from there). Nobody has offered a solution yet, but it was a very recent post.
Thanks in advance.

Oh yeah I forgot to say I use an ETHERNET connection.

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