NYTimes: Lyme Disease To Blame For JPM Trading Misstep

... after contracting Lyme disease in 2010, [Drew] was frequently out of the office for a critical period, when her unit was making riskier bets, and her absences allowed long-simmering internal divisions and clashing egos to come to the fore, the traders said.

The morning conference calls Ms. Drew had presided over devolved into shouting matches between her deputies in New York and London, the traders said. That discord in 2010 and 2011 contributed to the chief investment office's losing trades in 2012, the current and former bankers said.

"The strife distracted everyone because no one could push back," said one current trader in the office who insisted on anonymity because of the nature of the issue. "I think everything spiraled because of the personality issues."