Amazon S3 failing on "large" files

I am a long time user of SE finally stepping up to Pro for access to S3.

My backups to S3 are running. I am consistently getting failures for 3 files (which all happen to be over 100 MB). The rest of the file are uploading fine.

Here is a copy from the SBPro log(scrubbed for personal info like filename and authorizations).

The failure occurs after all of the data is appeared to be uploaded.

Ideas? Suggestions?
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Failed to copy from Source : Cloud error 404: HTTP/1.1 404 Not Found - The specified bucket does not exist (NoSuchBucket)

Stat Connected.
Sent 11/26/2013 10:23:47 AM: DELETE blah/blah -- HTTP/1.1
Authorization: AWS blah-blah
x-amz-date: Tue, 26 Nov 2013 15:23:47 GMT
Host: s3.amazonaws.com
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: identity
User-Agent: Mozilla/3.0 (compatible; Indy Library)
Recv 11/26/2013 10:23:47 AM: HTTP/1.1 204 No Content
x-amz-id-2: blah-blah
x-amz-request-id: blah-blah
Date: Tue, 26 Nov 2013 15:23:47 GMT
Server: AmazonS3
Stat Disconnected.

Stat Connected.
Sent 11/26/2013 10:23:50 AM: DELETE /blah/blah/SBSE____.KDI HTTP/1.1
Authorization: AWS blah-blah
x-amz-date: Tue, 26 Nov 2013 15:23:47 GMT
Host: s3.amazonaws.com
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: identity
User-Agent: Mozilla/3.0 (compatible; Indy Library)
Recv 11/26/2013 10:23:50 AM: HTTP/1.1 204 No Content
x-amz-id-2: blah-blah
x-amz-request-id: blah-blah
Date: Tue, 26 Nov 2013 15:23:49 GMT
Server: AmazonS3
Stat Disconnected.