For some reason, all of a sudden, my Nike basketball shoes no longer have any traction on them when I play in the gym. This pair that I have has only been worn for about 6 months and they have never been worn outside, only on indoor basketball courts. Now, I have to resort to the old "wiping the bottom of my shoe with my hand" trick every time play stops just to prevent myself from sliding halfway across the court when I try and cut. Any suggestions on how to keep the bottom of my shoes sticky? Thanks.