Unable to get RMA from netgear

> [...] My r7800 has lost wifi functionality since last night. The
> frequencies are broadcasting and can connect but the connected device
> says 'internet may not be available'. [...]

   If your (unspecified) "multiple devices of all types" can all connect
wirelessly to your router, then what makes this any kind of "lost wifi
functionality"?  Have you tried a wired device?  If you disconnected a
perfectly good router from your ISP, then I'd expect a result like
"internet may not be available".

   So far, I see no evidence that your problem, whatever it is, has
anything to do with your router.  Perhaps if you had some/any evidence
of a router problem, then you might have better luck getting a
replacement router from Netgear.

> [...] Ive updated the firmware [...]

   To what?

> [...] Ive also installed previous firmware [...]

   Which was what?

   What's between your router and your (unspecified) ISP?  Some kind of
modem or other?

   What do the LED indicators on your router (or your modem?) indicate?
What does its management web site tell you?  Visit
http://netgear.com/support , put in your model number, and look for
Documentation.  Get the User Manual.  Read.  Look for "Troubleshooting".

> Any help would be great. [...]

   You first.