WNDR4000 disconnecting wireless devices

My router is still using WPA standard security, it has been fine the past 1-2 years I’ve had it but the past couple of weeks I’ve had to unplug it and plug it back in almost daily because my phone/tablet are disconnecting. I’m trying to upgrade security but I can’t get to router login wirelessly. I’ve tried the Netgear Genie app (won’t work even when I use the router’s IP address) and the router login/IP address webpage. I also tried using my Xbox since it’s the only device connected to an Ethernet cable but the internet app won’t allow me to access the router login or IP address page. I just ordered an Ethernet cable converter for my Surface Pro as a last resort before buying a new router I don’t know what to do