Can not get Wi-Fi working with Pi 3A+

I have just bought one of the new Pi 3A+. Apart from the fact that it needs a good 3amp power supply before it will even boot (?) it seems to work.

I have downloaded and installed the latest Raspbian and set up Wi-Fi successfully.

However when I try piCorePlayer 4.1, I am unable to set up Wi-Fi. I first tried the wpa_supplicant.conf method - this seemed to work in that on booting it accepted the file - did its thing and rebooted. But no network found. On examining the SD card, wpa_supplicant.conf had been renamed to used.wpa_supplicant.conf and contained the correct information.

So I tried the 'setup' route. On selecting Wi-Fi, it showed me Wi-Fi on, but SSID, Password and Security were all blank. So I went through the process as described in the How To, saved the changes and had the correct values echoed back to me. I then exited and did pcp br.

On next boot I got Network not found, and on entering setup, it showed me Wi-Fi on, but SSID, Password and Security were all still blank.

I have been through this process at least 10 times, but whatever I do I can not get the entered values for SSID, Password and Security to stick.

I must be doing something wrong, but what ?

Any help would be gratefully received.

NWJ