Once the 169. series address is used, that won't change until you reboot, or maybe repair the connection (thats not always reliable)
No, just run ipconfig /release, followed by ipconfig /renew. That releases the DHCP-acquired address and requests a new one, when the router's DHCP server is running and able to provide it.
If you use a fixed IP address you avoid the kind of hassle you describe, GG, but there may be benefits with DHCP that are necessary in your environment.
SD