Just got my CPO G55 and have a question about the front windows. They "skip" about three inches from the top like they are jumping in their tracks. the driver side more than the passenger side. Any ideas if this is covered in the CPO warranty?

 

try resynchronizing the windows, roll the window down, then all they way up quickly release the switch and then hold the switch in the up position for a few seconds, you should here a click (key on ignition off so you can hear the click)

IIRC the window regulators and motor should be covered under CPO.