The good news for shareholders of Palo Alto Networks (NYSE: PANW) is that the stock has rebounded following a dismal 2016, jumping 16% in January. The not-so-good news is that wild stock price fluctuations are par for the course with Palo Alto. Now, after nearly two years of growing revenue more than 50%, Palo Alto is seeing its sales growth — like that of many of its peers — slowly coming back down to earth.