Server 2008 R2 effects other computers internet access on the same network

I have recently started playing around with Windows Server R2 at home on an old computer. The server works fine (just about) and I'm trying new stuff on it. I have it setup as a DNS, DHCP, Domain Controller and Deployment Service. Last night my family started complaining that they had no internet access. I had turned off the server a while before this. I've had the server setup like this for the past few days and turn it off at night because it's noisy and is in my room. They have not complained any other night or day n the past week so I'm a little confused. The only difference is that I updated the server yesterday. This may have been happening all along but no one may have noticed. It also may be the updates. My laptop which is Windows 7 Home Premium had internet access but was slow while 2 android devices had no access, a ipad, a Windows 7 Pro PC and a Windows 8.1 PC. I'm completely unsure how it is causing a problem on the network as I am new to this stuff. If anyone has any thoughts on this they would be much appreciated.