Issue with Netgear nighthawk wifi

recently purchased a Nighthawk wifi router and Im having connection issues with wireless devices. For some reason, anything that is wireless cannot hold a stable connection and automatically gets booted from the network. all devices that are trying to connect wirelessly either say "will reconnect when network quality improves" or "connected without internet". I've tried restarting the router several times and even tried forgetting it from the affected devices which didn't work. it doesn't matter how close or far you are from the wifi router. you could be right next to the router or on the 2nd floor and still have connectivity issues. from what I've noticed, when I turn off and on the wifi on my phone the connection is stable anywhere from five to ten minutes. wired connections work fine without any issue at all. any advice is appreciated. Thanks!