Well, friday afternoon wifi access was possible (with my private SSID and password, not the system one) but intermittent (ie would spontaneously drop but I could reconnect)..
I was going to wait for a quiet time to do the 60 second reset to see if it made a differemce. While waiting I connected to 192.168.0.1 and looked at the wifi settings and it showed that the SSID and passord had been reset to system (matched the ones that came with the router). The oddity is that I could still connect my my private SSID. So I mentally shrugged and reset the router via the web interface so that it has the SSID and password set to my private version , and I have had no problem since.
I am a little worried that I dont really believe I fixed anything, but will wait and see.