Cross DJ 3.2.1 Shut down when i'm Playing in Disco Club!!!

Hello, i'm new to the forum but i'm DJ Pro from several years. last week after 3 hours of DJ sets in a disco club Cross DJ 3.2.1 (only installed this version no earlier) began to struggle to upload some tracks, two in particular (which I had not already played the most loaded, the tracks are all purchased in aac or my productions in high quality mp3) ... and fortunately almost at the end of the last track that was playing at the end of the evening ended without notice showing the says "the program and 'closed unexpectedly ...". i use from many years some controller and programs of other "famous" brands,but it' s the first time that happens to me this doesn't happen anymore.I would not do any bad impression after years of Djing.I've done all the settings necessary.remove the stop of the disc, remove the lock screen and everything described in the FAQ already common for a long time, use a sound card native (U-Mix 46 mk2 with the control panel) and the dual external mixer and Akai LPD 8 set from me as a controller for the loading functions and effects, plus a few keys on the keyboard to other thinghs.I use 2012 macbook with 8gb ram and Lion with 320 HD.If someone can tell me something ... I thanks. Hoping that does not happen tonight. In my Mac I haven't installed any other software because it's only dedicated to DJing