I just installed a new RT-N66U and flashed to shibby's 112-AIO build (not Newdriver one) and am having trouble with 5GHz using 40MHz width. 2.4GHz and 5GHz w/ 20MHz seem OK. When I try 5GHz and 40MHz I can connect to the router, but after a minute or two the connection goes dead. I can not browse the 'Net and can not even get back into the router's setup. When I look at Win7's Network and Sharing Center I see the connection to Internet is broken for a while, then is OK for a while. It keeps alternating, but I can not reach the Internet or router. I do have an Intel 6230 card and read a little bit about a problem mentioned here but am unclear what exactly it is. Is it the problem I am having or something else? Any other help? Thanks!