Time Machine HDD keeps ejecting

Hi,
I've recently purchased a new iMac and have encrypted all of my hard drives - the only problem is that Time Machine has not yet been able to backup, it keeps getting part way through the process before ejecting the drive.
Any idea why this is?
Here are the log messages:
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
Ownership is disabled on the backup destination volume. Enabling.
Backup content size: 138.3 GB excluded items size: 20.1 GB for volume Macintosh HD
141.92 GB required (including padding), 1.82 TB available
Waiting for index to be ready (101)
Stopping backup.
Backup failed because the destination disk was ejected or disconnected unexpectedly!
Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
Error: (-43) SrcErr:NO Copying /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twis ted/internet/_posixstdio.pyc to /Volumes/Time Machine/Backups.backupdb/Matthew’s iMac/2011-11-02-112027.inProgress/417FD4B7-94EC-4BF3-835F-901E5299DB86/Macintos h HD/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/tw isted/internet
Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
Copied 728502 files (32.2 GB) from volume Macintosh HD.
Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
Copy stage failed with error:11
Error writing to backup log. NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
Backup failed with error: 27

I would recommend starting by reading both:
Time Machine FAQs & Time Machine Troubleshooting. If you continue to have issues please repost in the Lion forum. TM is considered to be part of OS X and because your machine is running Lion 10.7.2 then that would be an appropriate forum.

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*http://kb.mozillazine.org/Preferences_not_saved
Thee can also be a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry.<br />
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up guest users” (without the quotes) in the search box. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
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Step 2
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https://discussions.apple.com/thread/4148904?start=0&tstart=0
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Time Machine HDD keeps ejecting

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