Probably a mistake upgrading to a gigabit connection. DOCSIS 3.1 is much more demanding of line quality than DOCSIS 3.0, and that appears to be related to a higher frequency of problems reported in the forum. Hopefully you're getting some other benefit from the greater bandwidth, because gaming doesn't need it, and there's little advantage in the Hub 4 over the Hub 3. All of which is a finger-wagging not at you, but to any gamers reading this and thinking "nnnoo...shiney....gigabit...fast...mussstttt...have" about a Gig1 offer. For many gamers the usually superior latency of an Openreach line more than makes up for the modest speeds that may be available, and a 35 Mbps VDSL connection would be better for gaming than a 350, 600, 1G cable connection. Admittedly games will take longer to download, but it depends what matters...
Returning to your problem, suggest you post the hub's status data for downstream, upstream, network log in replies here (not as screenshots) and setup a BQM, that'll show what's going on with your VM connection. Post a link to a live, shared graph here and we'll see what's happening. Usually needs to run for 24 hours before we can draw reasonable conclusions, but the live graph will continuously update so you can do that immediately.
You can buy a gaming router if you want, and it will give better wifi and more control for tinkering with settings, but won't make a blind bit of difference to the lag issues, as they are between the cable modem and VM's network gear.
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The reason for the upgrade was mainly to preserve bandwidth for two gamers plus some streaming on SkyQ at the same time. I had a ok-ish connection before.
I have. only just set up up a BQM, however here it the latest. I see some strange ping spikes during off peak times? and a fair bit of packet loss this morning. As you can see there was an outage last night for a while.