I trade QID and today it initially did what it was supposed to do- while the market was crashing- it rose from 16.59 all the way to 20.43. Then all hell broke loose and it momentarily traded as low as 2.50. Did the ETF get "broken" somehow by the volatile trading? It clearly decoupled from the market for an extended period this afternoon. Other leveraged ETFs performed as they were supposed to all day and a few decoupled even worse than QID. Does someone smarter than me know what happened? These have become such popular vehicles and they seemed very unsafe today. I have a feeling this is going to be a major story.