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Sorry for revisiting this, but I had this very issue with speed dropping from 1000 to 100 every week or so. I changed ethernet cables and have not had the issue in 9 months. So this is very likely the root cause and easy to check.
A cable checker may not catch the issue if its intermittent, like something is loose. But you could try wiggling in your cable checker to see if you can make it go bad.
A cable checker may not catch the issue if its intermittent, like something is loose. But you could try wiggling in your cable checker to see if you can make it go bad.
