About two weeks ago I replaced a switch because it had spawned a number of bad ports over the last year. Now, the new switch also has failing ports. Of course I'm looking into the environment. I've already ruled out power issues (tried installing a newer, good UPS before replacing the first switch). That leaves me looking at network cards (or a wiring fault) somewhere in the building. Unfortunately, it's not necessarily the same ports that have failed on the new switch as on the old. Any ideas for nailing down what might be causing this?
It could, of course, also just be coincidence, but I need to start exploring sources before I RMA the new switch.