Wireless Flash Drive will not connect after 3.3.1 update

Factory reset and reinstalling the FW is really all you can do to reset the drive. I have WFD app version 1.5.1 and FW 3.3.1 and done see any issues. What type of device are you using with the WFD? Have you tried forgetting the network and reconnecting and force quitting the app completely? If you can let us know more about how you are connecting to the device and any error you get when trying to connect it would be helpful.