I've now had the regulator bolts in my rear doors replaced twice for the creaking sound in the windows. Both times it would great initially, no noise, then after a few thousand miles they start creaking again - annoying as hell. Can anything else be causing this? Why after a few thousand miles does it start again?

 

There are several areas of the doors that can creak and rattle. Here's the link to a great diy by DaveB that shows how to eliminate the common trouble spots:

https://g35driver.com/forums/g35-sed...-exorcism.html