I have a Canyon Grand Canyon 7 with a SRAM SX Drivetrain. I have noticed when I stop peddling there is a thump like every thing stopped but the back wheel. I have a couple older mountain bikes and they don't do this. Is this normal for this drivetrain? Do I need to repair it or work with Canyon on the warranty? I have been searching the internet trying to find a post of someone having a similiar problem and I just havn't found anything. Any help is appreciated.