This has been happening since early on (bought this router a few years ago now).  Anytime power is turned off on the router, either from a power surge or manually shutting off, when it's turned back on, it completely loses all the settings (wifi network names, passwords, etc).  Haven't seen anything related to this, and none of my other routers in the past had this issue (had Linksys, Apple, a few others over the years).  Even the Cox cable panoramic thing remembers my settings.  I've finally gotten to putting things I can't easily reconnect to the Cox router (my Onkyo receiver, it's not connected to the TV - i only use it for Pandora and speakers connected outside around my pool for example).  

Anybody else seen this before?  I'm about ready to just give up on the Archer and use the Cox router built into the modem.