Continuation of the Benzenedithiol reaction

So this reaction is really bugging my adviser. After our last success, we decided to scale up the reaction. When we did this, we did not get enough results (we got like a less than ten percent yield). So, we rewashed the water layer with a different organic solvent (DCM). This time, it worked. In the meantime, every time I tried to shake the reaction it exploded. So I had to stir it. Thankfully we got the results, so we decided to distill it to make it pure. Well we distilled for a good six hours and all we collected was solvent. The rest turned brown. Unfortunately we should have produced a white solid. So we are taking it apart next week to see what is wrong.