Ethernet cable slowing down connection

I did that yesterday, not very helpful. There were misunderstandings due to language barriers, and I got frustrated. All we accomplished was renaming the 2G and 5G networks. I recently upgraded to the next-gen Hughesnet and all the networks had the same name. I had already gone to the control panel and seen that (switched to 5G since my computer is in the same room as modem), but I didn't realize I could or had to rename them. The install tech didn't mention that. 

I was having trouble getting tech support to understand that I wanted to troubleshoot the ethernet connection, possibly check advanced settings. The agent kept focusing on other things like my phone and other devices on the network (none were connected, on purpose). The call was disconnected several times and I gave up. I'll have to try later when I have time.