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There should be a problem with the contact, you can try to change the lamp with a new one, and if there is still a problem, there is a problem with the contact of the lamp.
Find an electrician, either the switch is not badly dissolved, or the drive is a problem.
First, it is possible to connect the switch to the zero line, and exchange the zero and live wires; >>>More
Here's why. 1. Poor contact of power supply line.
2. Constant current IC failure of the drive power supply. >>>More
Two reasons, first, the bulb will have this phenomenon when it is loose, the solution is to check the bulb. Second, it is also possible that the socket is loose, and the solution is to open the panel to see if the wire end falls off.
LED lights have a light source driver and some circuits, a flash is very likely to be related to the drive power, and there are many reasons related to the quality of the lamp itself, Aike intelligent lighting answers, I hope to help you.