Who I have the same questioned this topic

I am not sure who can help with this. I have spent nearly 5 hours on the phone with Verizon support on two separate days and the issue is not resolved. Let me explain the problem.

I have 3 PC's and a printer connected to a Fios router via the ethernet. One of the PC's also has wireless capability. My problem is that at random times when I am trying to connect to any website, the browser will get hung up (sit and spin) and not load the page. This happens on every connected device (unable to determine if it is simultaneous), sometimes the page loads, and sometimes it does not. However, if I unplug the ethernet cable on my laptop and connect wirelessly, I NEVER have a problem with any website or email loading. When we do a speed test (via ethernet), the times vary, sometimes they are good, and sometimes 25% of what they should be. The router usually tests fine but it is the speed to the device that is the issue. I have changed ethernet cables and my longest one is only 8ft long. I am very baffled as 6 weeks ago, I did not have this problem and everything worked fine.

I contacted Verizon twice and was on the phone with them for literally hours. Finally, I convinced the last tech it is a router issue because all wired PC's have the issue but not wireless. Well, I just got the new router and low and behold, I still have the problem. It was not the router after all. I am at a true loss as to what the issue may be. 

Can anyone offer some advice/troubleshooting tips? Would be greatly appreciated. Thanks.