IP camera issues with RAX120

I just upgraded my router from an Asus RT-AC86U to a Nighthawk AX12 and I've been experiencing spotty wifi issues ever since. I have 6 IP cameras installed throughout my house and all of them have been cutting in and out, steams freezing up, disconnecting and unable to reconnect altogether, even ones that are located within 20 feet of the router. Some of the wireless laptops in the house have also experienced spotty and intermittent wifi issues with the router, although not as much as the IP cameras. The IP cameras are all various models like Amcrest, Foscam, D-Link, etc. All of them are 2.4Ghz. I'm not sure what could be causing this, it feels as though the router is having trouble keeping up with all the streams but I don't see how that can be since this router should be way more capable than that Asus I just replaced... Suggestions?