The ceiling light is controlled by my phone app but I can't use the remote control recently.
I tried to pair it again by: Power on Ceiling light and make the following operation within 60 seconds. Press the OFF + M button on the remote controller.
However, it keeps flashing non stop for few minutes. It then does not flash. when I press any button after that on the remote control, there is no response except the light blinks on the remote.