thanks for your reply. Still the same problem.
WTF? How can Intel bring out a WifI Card without usefull driver for it?
Another strange thing: when a change the "Chanel bandwith" to "20/40/80 MHz" andy "apply"
I know this isnt the last firmware, but its the only firmware that works perfect with my Cablemodem.
The latest firmware change to "20MHZ" as well.
This is looking like a router issue.
AFAIK, it won't bond multiple channels together if there are other networks in the area using those channels.
Use "inSSIDer Home" to check, but note that the free home version won't display bonded ac channels properly. The paid version (v4) does.
I suggest installing the Merlin firmware 374.40 stable.
This fixes a ton of issues and adds more features.
I don't know what that could be.
Maybe ask on the smallnetbuilder forum?
Let us know if you solve it!