wlan0 down

I have been having trouble with a reliable wifi connection.

I have been trying to set a static ip address to keep the connection active. My router dhcp shows the reserved address.

However, pi4 attempts to connect and then disables wlan0
If you restart dhcpcd it gives wlan0 a strange ip address

I finally found a recent google article but it didn't work, older ones are contradictory.

Is there a reliable current source? My wpa_supplicant.conf hasn't changed but I have tried everything else.

Anybody have an answer or a reliable source?

Thanks
Wallace