This won't add noise on a digital system. The data is either on or off, unlike analogue which is all shades of grey.Ends of RJ45 getting wet
That's possible, I don't have as much ambient light as @blake does in his picture. I see something a little similar to that on video during storms after lightning when the camera is trying to adjust to the lighting situation.Mine do the same. Only when it rains too. I think it has something to do with reflection of some sorts