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Last night I noticed that my DigiQ was extremely slow to respond and bring my egg up to temp. It lagged 70-80 degrees behind my dome thermometer. Eventually the DigiQ display read "28" and would not move from that number. Today I did the ice and boiling water calibration tests. Surprisingly enough my BGE dome thermo is dead on. My pit and meat probes are ~40 degrees off from one another. The "28" code also repeated itself today.
Scratching my head...time for a call to The BBQ Guru.