Just wonder if the battery is getting a bit flat on yours Brian as you say you look down on it, these things can become harder to see at an angle as the battery looses power but still fine if you duck down and look straight at them.
J
PS I see some of the latest versions of the far eastern mills are now coming with a couple of USB outlets so you can plug a cheap LED light or whatever you fancy straight in and nor have a wall wort and long cables hanging around.