Assign Static Ip?

I have a WSE2012 running in my home network.  I don't use remote access or the DNS server.  On domain clients, I set the DNS server to be automatically assigned (the external DNS from CenturyLink for me).

Currently the IP addr and DNS for the server are automatically assigned.

I am trying to assign a static IP:  IP addr 192.168.0.98; subnet mask 255.255.255.0; gateway 192.168.0.1 (current gateway verified by using ipconfig).  I don't reset the DNS---leave it at automatic assign. 

When I do this, I lose internet access on the server.  Does anyone understand why?

Is assigning a static IP addr a bad idea?