A local IT guy who I help out from time to time asked me to help him with a Intermittent Network issues on a segment he was having issues with. About a week or so ago I went to the building he was having issues with. This cable had been in place for at least 7 years or so and was a home run back to a switch that was feeding another switch with 3 PC's . He had already replaced the switch and a standard cable tester (AT THE TIME) was showing it was good. I carry a 200' cat 5e bypass cable with me and we bypassed the cable and let it run for a week...ok NO issues. Now it was time for the new run, This was in the wall and shows a critter got its way with it, looks like the installer most likely twisted or yanked too hard and damaged the coat then some mouse finished it off this winter or early spring.