No internet even though speed test works

Bought the router a week ago and need to reboot it a couple times a day. Each time the nighthawk app says no internet but my ISP app can reach my modem. So I reboot. This time again the nighthawk app says no internet but in the nighthawk app I can run a speed test, so it's definitely connected to the internet. None of my devices would get internet access until I rebooted though. Firmware is up to date, and again this was bought a week ago.