Where do you order your patch panel from? My current panel patch is having issues with a number of ports. At times it negotiate under 100mbps, thus it will not establish connection. Tried different cables and it did not fix the issue.
That kind of problem is usually due to an open pair. Get a simple cable tester first and make sure everything is wired solid. Your fix could be as simple as re-punching one or more wires on the back of the patch panel.
That said - monoprice.com is a solid source if you do need to replace it.