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I have recently installed a Pro Mariner monitor that sounds like the one you describe and have found the same problem. My probe is on the bottom of the boat, probably about 3 feet below water. The unit shows all three lights as green and periodically shows the Underprotect light as red. After a while it retests itself and returns to green. I have tested using an analog meter and the boat is well protected (in the 8 range).
The boat is in salt water but is subject to some fresh water from a nearby creek but I don't think that is having any impact. Have note had an opportunity to see what happens under way or at a different dock.
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