Lights Vu meters ddj SX

Hello,

I'm having a problem with the lights of my deck vu-meters. I already did a firmware update en software update, but this is not changing my problem. When I turn on the ddj all light indicators are working, but when i play tracks the individual lights of my channel vu-meters are not working anymore, also the load-buttons have no blue lights anymore... For the rest, everything is working perfectly.

Is there anybody who can help me out please ?

Thanks in advance.