Its massive balance sheet with hundreds of billions of dollars of insured customer deposits began to falter.
Every one of those models began to falter within 30 years or so.
But if the economic collapse of 2007-2008 demonstrated anything, any firm can falter if its credibility is called into question.
mid-14c., of unknown origin, possibly from a Scandinavian source (cf. Old Norse faltrask "be burdened, hesitate, be troubled"), or a frequentative of Middle English falden "to fold," influenced by fault. Related: Faltered; faltering.