I had that with my OWN security light, the one the HOA wanted on the
end of a section of townhouses.
First it only happened when the bulb was going bad, and later it was
all night. (Only on the weak AM stations, which I didn't seem to
actually listen to.)
Too high for my extension ladder to reach, when fnally the whole
fixture failed and they removed it, I saw that for some stupid reason
it had been set on ...I forget what they call it, but it's on at
half-brightness all the time, and goes to full brightenss if it sees
something. All I had to do was change the next one to be OFF when
it's off. If it comes on for a few minutes and the AM reception is
bad, that would just notify me there was someone outside or the wind
was blowing, which would be ok.
So look at his light and maybe he needs a new bulb, or maybe it's on
all night at half brightness, and yo can get him to change that.
I think you are on the right trail with interference idea. Bringing it
back in on the other pair and having it work fine means the cable is
okay. (The cable twist cuts down the interference.) Is there a good
ground connection on the power out in the trailer? Can you string a
couple extension cords from the building during off hours and try
different power? Could be the MRI unit- those throw off EM and RF like
mad. Ever seen how funny the video looks when a TV station tries to roll
tape in the room when it is running? Just for giggles, I'd try a long
extension cord and a long cat5 cable, and see if the modem and computer
work in the cab of your truck as far as you can get from the MRI building.
You could always line the trailer with expanded mesh or even chicken
wire, and make it into a Faraday cage... :^/
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