RhinoFish - 4:12 pm on Mar 21, 2013 (gmt 0)
2 & 3 don't match the timing you've described, but 1 does.
2 switch back in Q7 and Q8 didn't fix it.
3 was too late to tank Q6.
If forced to pick, knowing nothing else, I'd pin it on 1.
But again, to form a conclusion based on just this info, is a very likely erroneous. Much more detail and analysis is needed.