Problems with HDD after upgrade from lenny to squeeze

[James Brown <jbrownfirst@gmail.com>]

I use Debian AMD64 on my laptop AcerTravel Mate 3040.
HDD:
Model Family:     Seagate Momentus 7200.4 series
Device Model:     ST9500420AS
In the beginning ot this year I had the next report of smartctl:
193 Load_Cycle_Count        0x0032   089   089   000    Old_age   Always
      -       23521
(after using my HDD about 1,5 year).
On April 2011 I upgraded my OS from lenny to squeeze.
Now I have the next report of smartctl:
193 Load_Cycle_Count        0x0032   031   031   000    Old_age   Always
      -       139954

How I can debug and fix that problem?