Why does the light go out when you turn off a separate switch that does not apply to it?
In the corridor there is a switch for several ceiling fluorescent lamps. If the shutdown is not clear enough (it is often touched by accident with clothes), both the lamps connected to it go out and the LED in the vestibule, which is connected via a separate switch, briefly next on the circuit. Why is this happening, is it possible to get rid of this? The connection is normal, climbed onto the stepladder, checked everything, pulled it, does not seem to be short of anything, but the relative is afraid, she asked to understand.
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If an incorrect switch trips, then during the shutdown process there may be sparking, that is, an electric arc occurs in the switch. When an arc occurs in the network, there may be a small voltage drop, which affects the operation of the LED lamp. A working switch should work normally, switching on and off should be clear and there should be no intermediate “unclear” positions. It is necessary to check the status of the switch in the corridor and, if necessary, replace it with a known-good one.