Hi All, OK so tonight I took my ASUS N66U Router out of the equation and just hooked up my other Netgear DG834G modem router (My other Netgear acts as a bridge for the Asus)
Issue started again tonight as usual, this time from around 7:15pm through to just after 8pm. After that, everything normalizes.
See Screenshot here (download for full rez: https://drive.google.com/file/d/0B4XEz3WKcogEaUR5ZGEzWHg1X0k/edit?usp=sharing
In you netgear go to show statistics, it will look like this: