My ISP uses DHCP (a long time ago, they used static IPs), but my IP hasn't changed for literally months. That's good because I'm running several servers based off it. Luckily, if it does change, I can quickly update some DNS records and all will be well.
You should never really need to change your IP. DHCP should do everything for you. Maybe if somebody is trying to attack your network, then you can change it, but there's nothing to stop them from just attacking your new IP.
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