Finder freezes with Lion 10.7.4

I've had my macbook pro with Lion 10.7.4 for only about 4 or 5 months now and since I installed a 2 TB Seagate external HD Finder has been crashing periodically. I've been keeping an eye on the Activity Monitor when this happens and it doesn't look like there are any processes that are taking a lot of %CPU. I've already run a disk repair from the Lion recovery partition which seemed to solve the problem temporarily, but now its back. It only seems to happen when I have the external HD plugged in and Time Machine starts to run a backup.
I've been reading a lot of forum postings regarding this issue and I haven't had any luck solving it so I thought I would repost a new discussion in case someone was able to come up with a solution to this problem. Any help would be much appreciated.
Thank you

Well, if you are running too many concurrent applications and, if you don't have sufficient free space on your hard drive, then this will be a regular occurrence.
Try booting into Safe Mode then restarting normally.
I would also use a utility such as Mountain Lion Cache Cleaner 7.0 to clear all user, system, and font caches to be sure there isn't a problem with a corrupted cache.
If you still cannot resolve the problem, then I suggest erasing the drive and reinstalling OS X:
Install or Reinstall Lion/Mountain Lion from Scratch
If possible backup your files to an external drive or second internal drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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