Wi-Fi keeps dropping on my network but it only happens on my laptop.

For the past week or so, my wi-fi continuously drops on my MacBook Air (13-inch, Mid 2012, Yosemite-10.10.2). It's only happening on this computer and only with my network. When I attempt to reconnect, it says the network doesn't have an IP address so it can't connect to the network, yet I'm not having that problem with any other device in my house.

When I use xfinitywifi, there doesn't seem to be a problem. I have no idea what to do here.

Thanks.