we are evaluating an AD8368 at 140MHz on the ADI evaluation board. When the output power is up to 16dBm, the device performs as expected. However, at approximately 16.5dBm of output power, the device breaks into wideband oscillations. The behavior is only a function of the output power level, and any combination of gain control/input power that gives the specific output power acts the same. Could there be something wrong with the particular board or the particular device?