I think both @mayer and me are thinking the flux vapors and what else you have going on in the air is the issue here. The fumes can be corrosive (Acetic acid in the flux) so over time it can eat into exposed surfaces damaging them.
From what you've stated I can't see RF signals being the issue here. You would need an electromagnetic pulse to damage the transmitters in any radio system (Bluetooth, WiFi, etc...) I've not done any testing on how much of a pulse or what frequencies one would need to kill Bluetooth, so its possible Bluetooth is more sensitive than the others.
Here's a person subjecting an iPhone to a EMP pulse: [https://www.youtube.com/watch?v=4IRCq0fbX48|Electromagnetic Pulse (EMP) an IPhone - What Happens?] We don't know if Bluetooth or WiFi still worked afterwards as unlike the rest of the phone the antennas are exposed outside of the [https://science.howstuffworks.com/faraday-cage.htm|Faraday Cage] shield of the metal case, or in your case the AppleWatch its self.
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Here's a method of EMP measure:
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[https://www.radioeng.cz/fulltexts/2006/06_04_43_49.pdf|Methods for High Power EM Pulse Measurement]
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Here's a method of EMP measure: [https://www.radioeng.cz/fulltexts/2006/06_04_43_49.pdf|Methods for High Power EM Pulse Measurement]
I think both @mayer and me are thinking the flux vapors and what else you have going on in the air is the issue here. The fumes can be corrosive (Acetic acid in the flux) so over time it can eat into exposed surfaces damaging them.
From what you've stated I can't see RF signals being the issue here. You would need an electromagnetic pulse to damage the transmitters in any radio system (Bluetooth, WiFi, etc...) I've not done any testing on how much of a pulse or what frequencies one would need to kill Bluetooth, so its possible Bluetooth is more sensitive than the others.
Here's a person subjecting an iPhone to a EMP pulse: [https://www.youtube.com/watch?v=4IRCq0fbX48|Electromagnetic Pulse (EMP) an IPhone - What Happens?] We don't know if Bluetooth or WiFi still worked afterwards as unlike the rest of the phone the antennas are exposed outside of the [https://science.howstuffworks.com/faraday-cage.htm|Faraday Cage] shield of the metal case, or in your case the AppleWatch its self.
Here's a method of EMP measure:
[https://www.radioeng.cz/fulltexts/2006/06_04_43_49.pdf|Methods for High Power EM Pulse Measurement]