Situations in which it might be beneficial to use /release and /renew:
When connecting a computer directly to a modem.
When physically moving a computer from one network to another such as from an office network to home or from home to a hotspot.
When experiencing unexpected network outage.
When the result of running 'ipconfig /all' indicates a 169.254.163.6 address.
When a computer has an address in the 169.254.0.0 network, it indicates that the computer has not been issued an address from the DHCP server. (This is an APIPA address.)
When recent scope changes have been made on the DHCP server.