Pioneer DJM 900 Platinum Nexus - Color FX Crush Effect light goes off..??

I own a platinum 900 nexus mixer.. when i turn on the mixer all light and effects are working fine, after 20 to 30 mins the led light for the color fx crush effect stops working, however the function is still works but the light won't turn back on unless i stop using the mixer and leave it to cool down overnight.. what can i do?? please help!!!