Concerning my bike light radio, the volume pot is bad and always has been, so sometimes I have to tap it to make the sound work.
As for what happens with the light, after running for 30-45 seconds, the light begins to flicker on and off, and when I've held the speaker up to my ear I can hear very brief clicks, or pops as the light turns on and off. That's where I got the speaker part from.
I couldn't find anything obvious when I took it apart.
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