1. UnitedHealth Group's stock plummeted after a rare Q1 earnings miss, with revenues $2 billion below estimates and EPS $0.09 short; 2. CEO Andrew Witty's abrupt resignation and withdrawal of financial guidance due to rising costs have eroded investor trust; 3. Surging Medicare Advantage costs and insurance utilization create uncertainty, though long-term investors may see value at $335 per share amid potential pricing adjustments.