LMG5200: Using LMG5200 to switch power to RF drain

I am currently using the LMG5200 to control the drain volatage on 10W RF amplifiers at around 20v. I have also used it for controlling 50v Drain voltages to an RF FET. As long as I have used this chip it has been unreliable. I have done my best to check its layout and setup against ti reference designs and application notes and can't find any obvious things being done wrong in my setup. I am wondering if there is a common mistake people using these chips for this type of application might make. The chip goes into a hard failure sporadically and needs to be replaced. When the chip fails it stops switching the voltage to the RF drain or  sometimes it only switches a little bit of voltage and seems to draw more current than necessary almost as if it is internally shorted.