I have to turn the modem off and back on every

If it is wired through the LAN ethernet connection directly to your computer it is cause by unplugging the ethernet. Routers and modems hate a ethernet cable unplugged and will stop communicating if unplugged. You will have to reset almost every time. When reset the router goes out and looks at what is connected and then handshakes with it. If it is a wireless issue you can reset your wireless setting in your control panel. This shouldnt happen as your wireless network should always be broadcasting. Generally, to connect back to a router you only need to unplug the router to re-establish the connection to the modem. Going all wireless is the only way to fix this