Websites not loading on ethernet, but load on wifi.?

Here's my setup. Comcast Business Modem - we have a 1GB/s download speed and 950MB/s upload speed at my location (its a custom tier that we setup with Comcast). We are running a very specific fiber network here in my building. The modem/router combo sits in my office. Connected to it are 3 switches (each switch has either 12, 18, or 26 10GB/s ports on it and each port on every switch either connects to yet another switch or an Access Point. The fourth port in my office is connected to an older printer that doesn't support wireless tech (Yeah, its old). I deal with large files here and so I like to use ethernet to handle them. Its a lot faster than our old wireless N+ setup and it's a priority connection when im wired directly into the modem. I tend to use the ethernet port that the printer uses because we use that stupid printer once a week and there is no point in keeping it connected all of the time. Recently here, ive been unable to access sites while connected via ethernet. I pop the cable in and turn off wifi on my Mac and all sites go dead. All sites except Google and the Modem Config Page 10.1.10.x. I can search in google but the second I click on the page i was searching for it says it is unable to locate or access the server. If I disconnect the ethernet cable and refresh the page it loads instantly. No lack of server connection at all on WiFi. Like I mentioned above, its not like our ethernet ports are slow and they are absolutely not overloaded. Thanks!