RAX70 Smart Home, DoS attacks, WiFi speed issues

I've had a ton of issues with this router which is actually the RAX70 tri-band model. The one they said would resolve early issues with the RAX80. There are constant issues keeping smart home devices connected to the router. These include: LIFX bulbs (both older and newer models), Dyson Fans, Roomba vacuum, Litter Robot, Petkit feeder, Wemo smart plugs, Withings scale, HP Tango printer, etc.

The smart home devices show up in the Nighthawk App but show a link rate of N/A. With the recent update to the app, it now shows these devices as offline. I've tried going with factory settings, adjusting recommended settings like OFDMA, 20/40 coexistence, WMM & QOS for airtime fairness, channels 1, 6, & 11 as well as lowering speed from 600mbps on 2.4 network, disabling smart connect. I've tried what seems everything in the book to get this router to work, and nothing works longer than an hour to keep the devices connected.

I also experience the DoS Attacks constantly throughout the day. Yes, I know the false flags on port 443 from Amazon, Facebook, Apple, etc. These are present but there are also attacks from unknown locations in Germany, Hanoi, Canada, Netherlands, & more using ports like 59, 80, 179, 1338, 2222, 8000, 10009.

My WiFi speeds on WiFi 6 devices like iPhone 12 Pro's download speed will plummet to 12mbps. Pretty bad considering I have gigabit Verizon Fios. And sometimes it will kick our iPads off wifi. Armor has been enabled & disabled with no effect on the issues. Factory Resets work for about 10 minutes. I ensured to not use any channels on the 5ghz bands that conflict with nearby airports.

The router is out in the open and can be seen from most of the condo except the bedrooms. I'm seriously at a loss of how to fix the issue. Anyone seen this before or know how to resolve it? It's a bummer to think I might have an almost $300 paperweight bought a couple months ago. This is my first time using netgear and it's not enticing me to want to stay in the future if this is how it is with zero support options past 30 days. Slow speeds across devices, and all the constant DoS attacks below. These are all from the last hour.