NEW YORK (TheStreet) -- Panic selling has been the theme this earnings season for companies that issued weak guidance. Fearing the market may take a turn for the worse, investors sold off shares in F5 Networks , sending it down 9% last week. And that's not a good sign for rival Juniper Networks , which reports fourth-quarter results Tuesday. Juniper, which provides corporations with data traffic service such as routing and switching applications, has not had a great start in 2015.