NEED HELP ASAP GIG TONIGHT!!!

hi
im using dvs7 with the hd timecode cds. but after a while of playing using the cds the quality drops and the sound of the track goes all funny. PLEASE HELP!!!!!
im using dvs7 with the hd timecode cds. but after a while of playing using the cds the quality drops and the sound of the track goes all funny. PLEASE HELP!!!!!