2 sc6000 + x1850 engine lighting freeze

Good evening I have a problem with engine lighting .I need help, I am doing some tests at home with the players and the mixer, I have a USB soundswitch interface Connected to one player. At the dmx-usb as connected 4 par led, After configuring the pars they work, but during the test dj set at home after a few tracks the mixer freeze And it no longer allows you to make any kind of adjustment , the only solution is To turn it off and restart everything. Do you have any solution? The firmware are 2.3.0 for the player and 1.5 for the mixer

thank you very much Andrea