When you turn on one lamp, the second flashes (two-key switch)

Vladimir asks:
I connected two diode lamps to a two-gang switch. When you turn on the second lamp, both blink. So he himself connected point lamps and a fan to a two-gang switch in the bathroom. When you turn on the second keys on the fan, the lights blink. What is the reason and how can it be eliminated?
The answer to the question:
Hello! This is very similar to what is described in this video:

Check the connection diagram if they are connected in series. If not, then check the quality of the connections and ring the switch (if the contacts close normally).

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