a puzzle to solve...how does a battery operated flashlight interfere with radio signal??

i know certain appliances plugged into same electrical circuit can cause interference. but a flashlight??
this is happening in basement where i am installing 3 way switches and replacing receptacles

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Northwest · M

You did provide enough details, but my guess is that you scenario involves a TV or radio in the basement, and an LED flashlight.

If this is the case, the problem is that the LED flashlight is using non-EMC (EletroMagnetic Compliant) LED bulb.

The solution is to switch to a flashlight with LEDs that are EMC certified. This could also affect the operation of a computer as well.