What's wrong with my gas pedal!?

I have replaced the pedal sensor 3 times. Each time I
replace it, the same day, it will not work at least once that
day and then later it will work for a week or more then
randomly die on me again. My question is, if the voltage is
acting up at the pedal sensor, what kind of problem would
that indicate? And how would you fix that problem? I am at
a loss because everytime you hook up a scan tool it says
the same thing, that the pedal sensor needs to be replaced.
I really like this car and would like to fix it! Any help would
be greatly appreciated!