As this is a geekblog, I might as well document my woes here in public. Here is the support ticket I filed with Netgear just now. Hello, I purchased a WNDR3700 on 1/11/2011 – serial number 21840B550A390. I have registered the router on my.netgear.com. this week the 5 Ghz wireless network stopped working entirely. I…