Cant connect any smart home devices to Xb7 gateway!

So, today I upgraded my internet service and was given the xb7 to replace my 5 year old comcast router/modem. I have spent the last 5 hours trying to connect my smart devices and they just wont connect! The 2.4ghz just seems unresponsive or slow. Some of the devices I am trying to connect are generic wifi/alexa connectors but I have a Dyson fan and the Nanoleaf Aurora panels that wont connect niether! I never had any issues with any of these before and its driving me insane! Is my router defective?