It would help to know what year and how many miles on your vehicle. Try reinitializing the travel limits on your window. Run the window all the way up and hold the button for five seconds, then all the way down and hold for five seconds. My hunch is the regulator cable is stretched and needs to be replaced. IMO use OEM regulators.
Pelican Parts has great DIY articles available;
https://www.pelicanparts.com/techarticles/Boxster_Tech/77-BODY-Window_Regulator/77-BODY-Window_Regulator.htm