HT3275 Time machine keeps ejecting backup drive

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November 30

I haven't been able to make a time machine backup in 63 days.  Getting very concerned.  Running OSX 10.8.2.  Time machine spends a lot of time preparing, and after it finally starts making a backup it fails part way through.  I used to be able to make backups just fine using the same external drive.  Verified both backup and Mac disk.  Deleted TimeMachine prefs, re-started....still won't work.  Console only shows these messages for the daemon:
2012-09-30 8:21:43.989 PM com.apple.backupd[211]: Finished scan
2012-09-30 8:26:54.891 PM com.apple.backupd[211]: Found 638403 files (107.51 GB) needing backup
2012-09-30 8:26:55.397 PM com.apple.backupd[211]: 134.17 GB required (including padding), 39.51 GB available
2012-09-30 8:26:55.472 PM com.apple.backupd[211]: Deleted backup /Volumes/Mac Backup/Backups.backupdb/LarryH/2012-08-14-075425.inProgress/E3E8FC8B-ECD0-4074- 8CB5-EC0A04A7A609 containing 4 KB; 39.51 GB now available, 134.17 GB required
2012-09-30 9:52:22.463 PM com.apple.backupd[211]: Deleted backup /Volumes/Mac Backup/Backups.backupdb/LarryH/2012-08-14-075425.inProgress/F7D26A34-AA10-4B80- B63A-FF13FBC55552 containing 6.67 GB; 46.22 GB now available, 134.17 GB required
2012-09-30 9:52:22.467 PM com.apple.backupd[211]: Removed 2 expired backups so far, more space is needed - deleting oldest backups to make room
2012-09-30 10:11:09.000 PM com.apple.backupd[211]: Backup failed because the destination disk was ejected or disconnected unexpectedly!
2012-09-30 10:11:10.294 PM com.apple.backupd[211]: Error: Error Domain=NSOSStatusErrorDomain Code=-36 "The operation couldn’t be completed. (OSStatus error -36.)" (ioErr: I/O error (bummers)) deleting backup: /Volumes/Mac Backup/Backups.backupdb/LarryH/2011-04-23-070957
2012-09-30 10:11:10.294 PM com.apple.backupd[211]: Deleted 2 backups containing 6.67 GB total; 46.22 GB now available, 134.17 GB required
2012-09-30 10:11:10.294 PM com.apple.backupd[211]: Backup date range was shortened: oldest backup is now May 7, 2011
2012-09-30 10:11:10.295 PM com.apple.backupd[211]: Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
2012-09-30 10:11:10.296 PM com.apple.backupd[211]: Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
2012-09-30 10:11:10.296 PM com.apple.backupd[211]: Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
2012-09-30 10:11:10.296 PM com.apple.backupd[211]: Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
2012-09-30 10:11:11.240 PM com.apple.backupd[211]: couldn't determine volume-uuid of mount point: /Volumes/Mac Backup/Backups.backupdb/LarryH, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “LarryH” doesn’t exist." UserInfo=0x7f9eb1d42a50 {NSURL=file://localhost/Volumes/Mac%20Backup/Backups.backupdb/LarryH, NSFilePath=/Volumes/Mac Backup/Backups.backupdb/LarryH}
2012-09-30 10:11:11.805 PM com.apple.backupd[211]: Backup canceled.
2012-09-30 10:16:23.420 PM com.apple.backupd-helper[603]: Not starting scheduled Time Machine backup - time machine destination not resolvable.

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Replay

It's a 1 TB drive and my Mac Pro drive is 500Gb.  Time machine is supposed to prune old backup sets as needed to make space.  If you read the messages it appears that it was about to prune some more when the disk got unmounted.
2012-09-30 9:52:22.467 PM com.apple.backupd[211]: Removed 2 expired backups so far, more space is needed - deleting oldest backups to make room
2012-09-30 10:11:09.000 PM com.apple.backupd[211]: Backup failed because the destination disk was ejected or disconnected unexpectedly!
Besides, since when is it okay that Mac OSX spontaneously unmounts an external drive?

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