It has this one issue. It's a big one. That single non-overlapping channel. That's on the web and I'll stop about that.
There's also simple things like 2.4GHz cordless phones that can blast folk off the WiFi.
It appears that there is no real cure but to understand, try the usual noted in the CNET networking forums.
I have a 2-year old Netgear router WNDR3800 and Surfboard SB6121 modem that has been just fine until recently.
Lately, I have noticed my phone (Android 4.0.?) or PC (W7-64) is sometimes connected to my neighbors wifi rather than mine. I disconnect and reconnect to mine and it is fine. (Neighbor gave me wifi access when I moved here last year when I had to wait forever for Comcast to get their installation act straightened out. Nightmare story for another time). This happens to my phone frequently... only twice on my PC.
I also have a problem with my phone that wifi gets disconnected on a regular basis, but that is not new. That started happening after Android big upgrade a ways back. But only just recently my neighbors SSID started showing up sometimes.
I have rebooted/unplugged router to no avail.
What can I look for as cause for wifi instability?