Hi there,
A while ago I was having issues with high latency and lag spikes whilst in various games but also whilst browsing the internet pages wouldn't load and videos wouldn't buffer.
I'd bought a NetGear Nighthawk R8000 and was running the Virgin super hub 3 in modem mode, so I initially thought this was the problem. However, I took the router our of modem mode and back to router mode and the issue still occurred. Also since doing that test I've replaced the Nighthawk with a replacement to rule out it being a hardware fault on the router.
Below is what I'm seeing on my own PC when I run a ping -t to google.com, i'd typically see this to be running at 12-24ms, and below that is a thinkbroadband graph of a monitor I setup recently. This an typical example of what I experience.
Local Ping Test

I can provide any additional information needed and would appreciate any help/feedback.
To note: this has been occurring over a few months seems to be intermittent but recently has been occurring more frequently, and also this PC is running on a wired connection, but these latency issues happen with wireless too.