I just installed a new wireless router and I noticed my IP changed. Is that normal when you get a new router? Also, the speed of my internet is not really what is used to be. With my old router I would get 20Mbps. With the new one (the new one is supposed to be faster btw) I get test results ranging from 3Mbps to 14Mbps. Not really the 20Mbps it should be. Does the router need to adjust or something before going back to 20Mbps?