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Hi Mark, I can only presume something has changed in an update as I updated a noobs image and it now has the same issue. It seems if you cycle the interface on and off it sorts it out. Not ideal a I need to find the route cause.

Adding a couple of lines to the autohotspot script will work as a quick fix.
open /usr/bin/autohotspot
then in this section

createAdHocNetwork()
{
ip link set dev "$wifidev" down
ip a add 10.0.0.5/24 brd + dev "$wifidev"
ip link set dev "$wifidev" up
systemctl start dnsmasq
systemctl start hostapd
}

add two lines at the start so it look like this

createAdHocNetwork()
{
ip link set dev "$wifidev" down
ip link set dev "$wifidev" up

ip link set dev "$wifidev" down
ip a add 10.0.0.5/24 brd + dev "$wifidev"
ip link set dev "$wifidev" up
systemctl start dnsmasq
systemctl start hostapd
}

you should be up and running after a reboot.