Mark, your driver for 6235 was published in Dec 2013 and still doesn't fix the issue.
Packets are LOST after the first hop: ping 192.168.0.1 works OK, but when I ping the next hop I loose 50% of packets.
When I rolled back the drivers, the connection became stable again.
Working drivers (they worked for me).
15.9.1.2 (22.08.2013) http://dlcdnet.asus.com/pub/ASUS/nb/DriversForWin8/WiFI/WiFi_Intel_Win7_64_VER16152.zip
We are still preparing a class-action lawsuit against Intel on this case.
If anyone wants to get involved, email me at intel_classaction[@]ethaniel.com