My gear shifter button has been sticking and getting harder to manage

WD-40!!

Hey, I had the same problem with my chevy sonic lt 2013. This is a well known problem for the shifter button and the gear shift button. I had to replace my buttons it seems thru time this buttons start getting sticky and won't release the button that at one point you won't be able to put the car in gear at all. I order my buttons on ebay for less than 34.00 and replaced the old ones after that, my buttons were working just fine. There is a youtube video on how to replace the buttons.