Is it possible that the power went out on the dosers? In that case it is possible as the dosing schedule would resume from the start of the day once the power is resumed. The X1 time is then adjusted when reconnected via Bluetooth with the app. Other than that I would make sure the app is updated and ensure your dosing schedule is programmed correctly. My guess it is a power outage or power down of the X1 causing delays in dosing. If you continue to have issues please contact our support portal at coralvue.com/support.