I've had FiOS Gigabit for about a year and a half, and it was pretty solid up until recently. I had verified speeds when we first got the service by using several third party sites (primarily speedtest.net), which clocked them at 800+Mbps so all seemed well. Two weeks ago, my desktop PC started having all kinds of connectivity issues, including terribly laggy and inconsistent download speeds, laggy gaming performance, and even a complete loss of connectivity for a few minutes one night. I've been looking into it, and what I've found makes absolutely no sense to me.
I have three PCs on my home network, all of which were getting gigabit speeds until this started. On two of these PCs now, speed tests show download speeds between 300 and 600Mbps, usually in the mid 400s on one and 600s on the other. Strangely, upload speed from these two PCs is perfect, clocking over 900. On top of that, the third PC on my home network shows perfect download and upload speeds, 900+ on each. If I take the same exact patch cable on the same router port from the fast PC to the other PCs, they still report half download speeds.
I've run Verizon's speed test on all three, and here's where it really loses me: all three report 900+ for both upload and download. If that tool is accurate, what this means is that for two of my PCs, connectivity through to Verizon's network is fine, but drop to half speed going beyond that - but the third PC does not have this problem, and gets fast speed all the way through.
I spent an hour on the phone with a Verizon rep who went through factory resetting the router with me, which had no effect on anything (I've been using basically the default settings all this time anyway). They also restarted the ONT box. A tech came out to my house today and didn't have much input beyond connecting his tablet to my router and showing that Verizon's speed test was clocking his device at 900+. I showed him the speed tests from all three PCs, and he said it must be something specific to the two PCs.
I've combed through every setting. I've reinstalled the NICs, disabled and re-enabled all offloading and other features. Nothing has made any difference. All are directly connected to the router, and if I switch connections between the working and nonworking ones, there's no change. Again, if Verizon's speed test is to be believed, then all three of these PCs have perfect connectivity to their network, but only one is allowed to have fast speeds beyond it for some reason.
