I have a wifi extender on my network. Turning this OFF seems to resolve the issue. http://www.netgear.com.au/home/products/wireless-range-extenders/WN3000RP.aspx

Hi, I am having the same problem here. Seems like the DHCP server suddenly stops running. A reboot, or disable/enable of the dhcp server from the web interface seems to reset things, but it's VERY...