Diagnosis
Weak Wi-Fi signal at the grill's location or an outdated app/firmware causing a handshake failure.
How to Fix It
Improve the signal. Move your router closer or use a Wi-Fi extender. The grill's antenna is in the control panel, so ensure it's not tucked right against a metal wall.
If That Didn't Work
Reset the grill's Wi-Fi module. On the controller, hold the 'Wi-Fi' button for 10 seconds until the light blinks rapidly, then re-pair it in the app as if it's a new device.
Heads Up
The Pit Boss app is notoriously finicky. Make sure your phone's app and the grill's firmware are updated to the latest versions—check the Pit Boss website for firmware files.