Intuitive Surgical (NASDAQ:ISRG)-- maker of the daVinci Robotic Surgical System -- and its investors have experienced quite the roller coaster over the past year.  From medical professionals publicly questioning the necessity of robot-assisted surgery, to hospitals tightening up their budgets with the onset of the Affordable Care Act, the company hasn't been able to catch a break.

For a while, it looked like fortunes had swung back in the company's favor. In mid-January, Intuitive came out with preliminary earnings that were more upbeat than expected, and shares jumped almost 10%. But when the full report was issued a few weeks later, the stock's dive continued.

So, what gives? In the video below, Motley Fool contributor Brian Stoffel fills you in on two key details that raised red flags for investors, and what they might mean for the company moving forward.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.