Slow Internet Speeds on Archer c7 v5
Hi
I have a 200mb broadband connection provided by my ISP (virgin media) with their own hub in modem mode, and the C7 connected to via the WAN port to LAN port 1 on the hub.
I have always had excellent speeds of around 220mb down and 20mb up which is about the max on my connection. This has worked reliably with the C7 until recently, when the ISP had an outage.
When they came back up my speeds both wired and wireless via the C7 are around 40% slower. When I run a speed test, they first go up to near 200-220, then slowly fall away to settle around 110-140mb.
I have tried factory resetting both the ISP's hub and the C7 and going through setup again. Sometimes, after a reboot of the C7 it resolves itself for a while, but after a couple of hours the issue re-occurs.
If I connect direct to the ISP's hub and test i get the full 220ish.
Any suggestions/ideas? I've had an engineer come take a look at the ISP's kit and he found no issues. I've done all the obvious stuff, like swapping out cables and disabling unused services in the router.
Thanks in advance
Matt