Why does my 27" iMac with Lion 10.7.3 keep Freezing?

I will be working on something (typing this for example) and all of a sudden everything stops and the spinning wheel will come up.  Then after 30 seconds or so everything goes back to normal. 
Here is info about the computer:
Model Name:          iMac
Model Identifier:          iMac10,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz
OS: Lion 10.7.3
I have tried repairing disk permissions sucessfully but this keeps hapening.
Bob

I suggest verifying the SMART status of your hard drive. In addition to using the Disk Utility application located in the Applications/Utilities folder, I also like to use the Smart Utility application from Volitans software. It will read and display the contents of your hard drive's SMART (Self-Monitoring, Analysis, and Reporting Technology) log files. If the SMART Utility application lists your SMART status as failing then I would carefully back up the important data and seek service. A hard drive that is in the process of failing can cause the issue you are describing.
http://www.volitans-software.com/smart_utility.php

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