Danny if it is happening at 2K-4K then calibration isn't going to fix it, that only fixes the off idle position.
There is either something causing the pedal to physically bind and stick in a position or there is something wrong with the resistive strip. The inside of the pedal isn't all that unlike the fuel sender, if contaminates get on the surfaces it may misbehave. But other than checking for binding issues don't take your pedal apart, just get it replaced.
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