@Tony I have this problem with my X5700 and it's very annoying to keep switching back to .1 from .4. When I'm working remotely I can no longer access my PC as my IP for my port forwarding have...

@Eric0054 Check your DHCP IP Range as if the IP is in the range of your DHCP then you can't reserve that IP.

@TP-Link You can reproduce this bug everytime by powering off your Deco for a couple minutes. When you power it back on your IP will be 192.168.4.x as it does not keep the subnet you assigned it.