Piper Jaffray analyst Troy Jensen downgraded F5 Networks (FFIV) to Neutral and lowered his price target for the shares to $136 from $144. The product refresh cycle is not playing out as expected and product growth "could remain challenged," Jensen tells investors in a research note. His firm's Q2 channel survey highlighted a quarter-over-quarter downtick in demand for F5 with below plan responses outnumbering above plan responses, reversing a three quarter uptrend. Jensen says the negative preannouncement from A10 Networks (ATEN) only compounded his concerns. The analyst believes F5's previous growth assumptions and forward earnings are at risk.