Problem: You have connected a WiFi-based ADS-B Receiver or other avionics and the iPad is no longer connected to the internet over the cellular network and is no longer receiving Ozrunways Traffic.
Solution: This is generally caused by the ADS-B device's WiFi configuration advertising a "router" (or gateway) that the iPad will try to use to connect to the internet, obviously without success.
Some vendors have rectified this issue in later firmware versions, so make sure you first update your device to the latest version. If that doesn't fix the problem, it would help to contact the vendor and explain the issue. It may help to include a link to this page.
For vendors that have not made this change, to make the iPad use the cellular network again for internet while still being connected to the external device, the wifi network can be manually configured.
Step 1: go to Settings > Wifi on the iPad and tap the blue (i) icon for the connected network.