I've been picking up DTS lasers recently, and have come to notice a problem. For a few of my discs, when I play them I get no audio. This happens with Jurassic Park, The Rock, and Apollo 13 (All DTS releases). I can remedy this problem by putting in another disc...so for example, I put in Blade, start it and stop it, then pop Jurassic Park back in...and bam, sound. I'm using a Pioneer CLD-D704 with optical running to a Sony E800 which connects to my receiver. I've only had the problem on DTS discs...all of my AC3 and PCM discs work fine. Any ideas?