DJM 900 NXS2 levelmeter bit

After 4 weeks sometimes one levelmeter bit (-15db) keeps dark.

When i turn off the mixer this bit is working again after ca. 1 hour

Has somebody else this phenomenon?

@Pioneer: Is my mixer level meter now defect?

Details:

- Phono signal

- USB connection to serato with timecode signal

- Changing to normal vinyl signal or restart the mixer is not solving the problem,

only after a while this bit is working again

- Maybe a problem with environment (temeratur (mixer is not hot), wetness (hygrometer level is fine), high frequented timecode signal...?) or loose connection of level meter, oxidation or hardware / software problem ?

Thanks for your help

Nils