I have a PTZ camera and a bullet type camera that are both aimed at the gate on my property. I have the blue iris program set to sound an alarm thru the computer when a vehicle approaches. Both cameras function fine during the day but for some reason at night, when a vehicle approaches, the BI program is not pushing the alarm to the computer. Both cameras are seeing the motion and go into the record mode at night, but for some reason, the computer does not sound the alarm and I am not getting a push notification. Anybody have any ideas on this?