The crackling sound is actually sparking within the switch and dangerous.
I have seen many switches and outlets falling apart due to either heat or poor quality.
It is possible that the bathroom switch may be in the same GFI circuit as your other light.
You do not need to call an electrician, a good knowledgeable handyman can fix the problem.
I am a handyman and do a lot of work in TV.
Manny The Handyman, LLC
352-530-2583 home/office
610-570-5303 cell
Last edited by gemini5001; 10-04-2020 at 08:05 AM.
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