NomolosTooqay

I had very creaking door handles on my 2010 GLK, it was driving me crazy, ever time i went over some bumps or my knee rested against the door handle, it sounded like some Lego pieces flexing, annoying cheap sounding creak that should come from a Kia. I took it into the dealer and complained about it on all the door handles, they put in a request to have them all replaced for me. I waited about a month before the parts came in and it took them a couple day to install them but the difference is night and day. They are solid as a rock now with no flex while grabbing them, and no sounds anymore. I am so happy that i took the time to actually have them change these out for me, I suggest you have the dealership take care of it asap because it is definitely curable.

KurOranj

If this has not been solved, I may have experienced the same strange, "crinkling" and "static" noise when the vehicle is at lower speeds, especially turning a corner. I don't know if it is permanently fixed (as it has only been 10 days since trial), but here is what I did:

I took a clean rag and applied a tire shine product (Turtle Wax Ice Synthetic Tire Shine) to it generously (moist - not sopping). Then, I simply wiped down the entire insulation/seal to each door, especially the velvet-like top of the window frame. I was careful not to get on other parts of the body just in case. It instantly stopped the problem.

In fact, in a nod to scientific process, I only tested on the one door for a few days. I could still hear the noise in the other parts of the truck (GLK350), so I performed the same trick on those too. Been silent ever since. Even it comes back, it won't take that long or much expense to redo.

Hope this helps.