OK, so after being thoroughly frustrated for weeks I used a wired connection to the router and reconfirmed the latest firmware, there had been another update, installed it. Because the problem of...

I've had the same problem. Got the Archer C7 V2 for Christmas, using a 1 year old laptop running Windows 8.1, Broadcom 2.4GHz 802.11n wireless adapter, have upgraded to latest software/firmware on...