New firmware cdj2000nxs2 audio stops

Hi i play with the new cdj 2000nxs2 we do the firmware update to the 1.40, if we are playing with relordbox dj im hid mode, and the we switch the cd player that is not playing from link to usb to search a song also on a usb stick, when we press usb, also the audio that is playing from the other cd through rekordox stops, with the old firmware everything was ok. Could i reinstall the old one??