Time Machine repeatedly "must create new backup"...

Hi there - I have a fairly specific problem:
After replacing my 1TB HD at Apple's suggestion, I was able to successfully restore my data from Time Machine backup which resides in a Synology NAS (DS210j to be precise). So far, so good.
After about 3 days of use, I get a pop-up message from Time Machine stating that it has completed a verification of my backup and concluded that it must make a new, full backup. This then wipes my entire history of Time Machine back-ups and then proceeds over another 3 days to complete another backup.
So far, still reasonably good.
The problem is that after the 2nd full cycle of this (ie. full backup, verify fail, full backup required etc), the message continues to recur.
I have read through Pondini's FAQ (esp. C13) and I am still at a loss because my set-up (TM via NAS) has been stable up to this point and I had more than 1.5 years worth of Time Machine back-ups until the fateful day when I replaced my iMac hard drive.
I have tried to address as many of Pondini's suggested reasons as to why C13 might recur (including rechecking power supply etc) but am at a loss because the set up was working before and nothing has changed other than the replacement of the hard drive in the iMac...
One of the things I have tried is to check my computer name via System Prefs -> Sharing and noted that my Computer Name is the same as before the backups but "Computers on your local network can access your computer at: XXX-2 (i.e. a duplicate)". So I have now edited this to make this the same as the computer name (to remove the potentially offending -2).
I also downloaded TM Buddy and wanted to post the following the log:
Starting automatic backup
Attempting to mount network destination URL: afp://[email protected]/Time%20Machine
Mounted network destination at mount point: /Volumes/Time Machine using URL: afp://[email protected]/Time%20Machine
Runtime corruption detected on /Volumes/Time Machine/XXX.sparsebundle (fsck_hfs -q termination status: 3)
Network destination already mounted at: /Volumes/Time Machine
Recovery backup declined by user.
Backup canceled.
Ejected Time Machine network volume.
Attempting to mount network destination URL: afp://[email protected]/Time%20Machine
Mounted network destination at mount point: /Volumes/Time Machine using URL: afp://[email protected]/Time%20Machine
Forcing the backup image to mount read-only because it failed verification or is immutable
Disk image /Volumes/Time Machine/XXX.sparsebundle mounted at: /Volumes/Time Machine Backups
Starting manual backup
Network destination already mounted at: /Volumes/Time Machine
Recovery backup declined by user.
Backup canceled.
Failed to eject volume /Volumes/Time Machine (FSVolumeRefNum: -126; status: -47; dissenting pid: 0)
I am running OS X 10.8.2 on a 2.93 GHz Core i7 27-inch iMac (mid 2010)
Anyone have any suggestions?
I am in the process of reformating the Time Machine back-up disk (i.e. the drive in my NAS) and trying the full backup again but thought I would ask here in the meantime since it's going to take 3 days or so to complete that anyway...
Any help appreciated.

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