Tethering topic

Hi everyone, i have searched for fix for my problem but without any luck. My problem is, tethering works without problem, good connectivity and so but it keep disconnects every one hour. I don't know whats wrong. I need it unlimited but dont know how do make it. Im using usb tethering, dont have internet on my PC but so I using friends and with his WiFi I making tethering conn. for my PC, I dont use mobile data for that. So pls help, i need it unlimited and very stable. Thank you very much. I have LG G2 D802.