I have had problems with some videos getting laggy throughout fundamentals 2. I have checked this issue with other sites and no problems. Most have lessons on here have been just fine. I even checked my internet and youtube etc. no problems at all anywhere else. "Play along with carre groove in the key of G" in the 5th chapter towards the end (in fundamentals 2) is laggy in the same spots (I tried it 5 times) and crashes around 3minutes and 10 seconds. When i try to pass that spot, the video starts over with the same issues. The next video, plays just fine! It is that specific lesson.