Cross keep cutting out.

Hi does any one else who uses Cross, have the music go blank or cut out for half a second, when mixing songs, it usually only happens when mixing song on thePC or usb. when i switch to line and play a real vinyl sond from a real record through the line on the program it is ok?
it is either the cables, programe, or computer is to slow, , i have not upgraded to Cross 2 as i found it difficult to use with U46mk2, they would not sync together, had to unistall and then reinstall cross1.3, the version that came in the box.
any ideas to upgrade and enjoy my Cross DJ,
Thanks
it is either the cables, programe, or computer is to slow, , i have not upgraded to Cross 2 as i found it difficult to use with U46mk2, they would not sync together, had to unistall and then reinstall cross1.3, the version that came in the box.
any ideas to upgrade and enjoy my Cross DJ,
Thanks