As Fool contributor John Grgurich noted earlier, today's decline in the bank's stock could stem from the fact that JPMorgan faces a critical shareholder meeting in less than two weeks, after which the role of CEO and Board Chairman Jamie Dimon could dramatically change. JPMorgan's share-price drop wasn't out of line with the performance of other banks, as fellow Dow component Bank of America ( BAC -1.67% ) fell 0.8%, while Citigroup ( C -1.89% ) and Wells Fargo ( WFC -2.96% ) lost about the same percentage as JPMorgan. Moreover, news of the lawsuit didn't move JPMorgan shares substantially in early after-hours trading. But the suit is troubling for a couple reasons. First and foremost, the card-collection lawsuit makes allegations that look eerily similar to the mortgage robosigning debate that led to a massive settlement among various mortgage lenders.