Authentification Error usually is related to a wrong password. Please check again! (I had the same issue some while ago…)(Check, also if you turned off security at the router, maybe there is still the (possibly wrong) password in your FP’s Wifi-setttings.)
Hi - yes I have checked the password, rebooted the router even reset it so no password was required but I still can’t connect. I will check tomorrow on a friend’s WiFi.
Have just tested it on another WiFi and no luck there either. I am now sure it is a hardware problem as I have done a hard reset and tried everything at the router end. Also my experiences seem similar to those of @peter_goldi here Can't connect to wifi and others here Unstable Wifi connection - and that turned out to be hardware related. Perhaps the wireless antenna daughterboard has come loose. Annoying as it has only just been repaired …
Thanks for the advice everyone.