edward is right on the money here
when the motor runs during lowering mode it creates a pressure which can slow down the lowering process.
Find out why the motor is running during lower mode and fix that and you might find the lowering will speed up once that is repaired.
Check the switches on the lowering valve or control handle linkage.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.