Why does my MacBook Pro still have disk problems even with replacement disks?

I have a 2008-era MacBook Pro. In January it failed to boot. I took it to Apple and paid for a replacement system board. When it came back they told me the hard drive was also bad and they had replaced it.
About a month later my performance became very bad. A test of the hard disk revealed unrecoverable errors. I reformatted the disk and restored from Time Machine. About a month later, the same problem surfaced. This time I took it back to Apple and they put in a replacement hard drive.
Now here I am about a month after that and the hard drive has asked to be reformatted twice again.
What is REALLY wrong and how do I get it fixed?

How does the disk test which checks the drive have to do with corrupted data?
Let me clarify:
1. System gets slow.
2. I run the Disk Utility > Verify disk.
3. It reports data corruption errors and and says to run Disk Utility > Repair Disk
4. I run Disk Utility > Repair Disk
5. It says errors are such I need to run it from the Utilty partition
6. I restart from the Utility partition and run Repair Disk
7. It reports it can't fix the problem. Tells me to erase the disk and restore.
8. I do all that.
9. Now I run Verify Disk again. All is well, and all continues to be ok for several weeks.
So, if the Time Machine backup was corrupt, step 9 above would fail.
Since this is the third hard disk since January, I doubt that the problem is REALLY the disk.

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