Nighthawk X6S stops working and has to be restarted daily or every other day

Since I’ve had this router it has continuously stopped working on a daily basis or every other day. I have to log in to the app and restart the router through the app and everything continues as normal. The router also has never performed close to the speeds my internet provider puts out. At best I’m getting about 80 download speed when I pay for 250. I’m so busy I’ve just continued to reset it and deal with the issues rather than take care of them. I’ve spoken with the internet provider ran all tests and they concluded it was the router. Any help would be extremely appreciated