Diagnosis
You're getting a power interruption. The most common culprit is the 3-amp fuse on the circuit board blowing. These grills are power-hungry and sensitive to voltage dips.
How to Fix It
Unplug the grill and let it cool. Open the control panel on the hopper. On the main circuit board, you'll see a small, clear 3-amp fuse. Pull it out and check if the thin wire inside is broken or blackened. Replace it with an exact 3-amp replacement fuse. Don't go higher or you'll risk frying the board.
If That Didn't Work
Check your outdoor GFCI outlet. These grills can sometimes trip them. Try a different, non-GFCI outlet (with a heavy-duty extension cord rated for 15 amps) for a test run to rule out the outlet being the issue.
Heads Up
If the fuse keeps blowing, you've got a deeper electrical gremlin, likely a bad auger motor or fan motor drawing too much current. That's a service call.