Reply to Played out for my 1st gig, 6.5 hours. Aweseome! Traktor skipping/stalling issues

Had a blast. Being a bedroom DJ, I was a little surprised when a friend asked me to play a party. It was an awesome experience to prepare for and do. The crowd went crazy and had a freaking great time. It was great to test out my QSC K10's and K181 sub as well.

So about 2 hours in my 6.5 hour performance, I started noticing songs randomly nudging out. It started small and then came huge swings. It got to the point where I was feeling nervous having two songs playing at once so I starting shortening up the transitions. Eventually, it got so bad that a song wouldn't play at all. There was complete silence for about 20 seconds. I pressed play like 15 times before it would start playing the track again. It literally, just stopping playing a track for no reason and wouldn't start it again for 20 seconds. All is good though; I got a TON of compliments last evening and people of all types and ages where having a crazy good time. What a difference live performance is.

Here is my setup. MBP 17', 2.2 GHz Intel Core i7, 8GB DDR 3 Ram, standard 5700 RPM Sata drive. I had wireless off and nothing else running. I did a cold boot with my Traktor S4 USB plugged in, and proceeded to turn on Caffiene and then traktor. Traktor Pro 2.6.1 (everything up to date), and running in full screen. I never had more than 2 decks running at once.

The load meter never displayed anything but the lowest blue bar.

All last evening and this morning I have been believeing something is up with my Macbook Pro, but now I am wondering if its an issue with my S4. This problem never happened before. I have used my setup for 5 hours in a row before at home. The only thing different this time though was that we had the music blasting and TONS of bass. I wonder if the issues I was having was not a load/traktor issue, but rather an issue with my S4's platters vibrating from the music...

Any ideas/help?