Normal
There could be a number of reasons why this happened. A software update, either on your host machine or within the VMs, could have caused this. Installing FreeBSD shouldn't have affected the network settings, but it's possible if there was an error during installation. It's unlikely that your ISP blocked your VM, but you could check with them just in case. It's also possible that there was a temporary glitch or a hardware issue that caused the settings to change. It's hard to determine the exact cause without more information.