Pull the power out of the apex and modules. force reboot if you dont have the display working anymore. see if it reattaches to your wifi so it can reach Fusion. As DTW said I also saw many issues with my wifi connection with the Classic. THe new version I have had no issues at all with connections or wifi(also got a better router so probably helps).
After reboot if not working. Did you have your static IP written down? See if its pingable from another device. Might have lost its IP also which you will need to connect it directly to your pc to reconfigure. Check your Wifi router to see what devices are connecting that might help you ID which IP it is trying to use if your have DHCP enabled.