Each gate has a reflector next to where it closes, on the opposite side of the road from the LiftMaster. When the temperature changes quickly and humidity is high, the reflector can fog up. Wipe it off and the gate should start working again.
If that doesn’t fix it, wipe the electric eye on the opposite side of the road — the one pointing toward the reflector you just cleaned. That should close the gate.
Ivory Canyon entry
Held open 7:45 AM–5:00 PM Monday–Friday and 8:45 AM–4:00 PM Saturday. Outside those hours, all gates should be closed.