Reply to S2 and macbook lag issue

Hello everyone. Just got my S2 and have a problem with lag when I stop track 1 from playing, when track 2 is also playing. If I go to stop a track to load another the track that is playing lags or skips.

I have a Macbook 2.4ghz with 4GB ram

Latency is 256

Traktor Pro 2.6

All wifi off, and nothing running in background.

Any reason why this is doing what its doing? It's very frustrating. I have the X1 and do not have this issue with lag. I have the S2 plugged in and also the Macbook plugged in.

I appreciate any feedback.