I think localbitcoin is blocking and keeping the account in forced holiday when the account IP address change is found, This experience i got personally. I lost 0.8 bitcoins.
that sucks, what if your ISP uses a dynamic IP for you and it changes after like a week would they still block it?
Having dynamic IP is fine as only the last 3 to 5 numbers of the IP changes. Sometimes the whole IP will change if a new router is used or the ISP has assigned a totally new IP address. In most cases only last few changes unless the ISP has assigned it to change the whole IP and even then will be fine.