EL stopped working during a set

After a 1:30 hour set engine lighting stopped working for the second player (CH 3&4) after I loaded a song to player one (EL Player).

Stoping EL on player one resolved the issue for CH3&4 but now CH1&2 stopped working.

Restarting the mixer didn’t help, but after the restart I couldn’t see the attached drive from Player one over link anymore.

Restarted player one and I can see now the drive from player one on player two but EL is still only working on CH3&4.

Reloaded new songs on player one and EL starts to work on all 4 channels.

Player and mixer are on the latest firmware 2.0.2 and 1.5