DJM800 All Cue & FX buttons not lighting up but still working

I was using my DJM800 yesterday for a few hours. All was well then out of nowhere all of the cue buttons,FX buttons and the effects button wouldn't light up but they all still worked. I knocked the mixer on today, the only difference being that all of the cue buttons for the channels and master have lit up but in a very dim orange not the vivid bright orange they normally do. Any input would be appreciated. TIA