AC3200 rebooting issues

I am having an issue with my Router rebooting all the time. This happened since downloading and instaling the newest firmware for security reasons. I am having the same issues as this topic ( https://community.netgear.com/t5/Nighthawk-WiFi-Routers/R8000-rebooting/td-p/494441/page/2 )

I thought by spending $300 for a top of the line router I wouldnt have connection issues but it seems this model is super buggy since the update. I bought the unit in July and never had rebooting issues or IP changes. Now when it reboots it changes the ip's of a few connections. I have since reserved the ip's so they dont change (for remote vpn login reasons). I get regular loss of wifi signal on the 5ghz signals. I only attach 1-2 streaming media devices to those ports (amazon fire stick, apple tv ect...) and they seem to work ok for a while but drop after about 45min of use. 

Any ideas on this. It seems that this model has been buggy for years since it was released. I only have 2 hard line connections and around 5-8 wifi connected devices at a time. Again as I said I havent had an issue until the firmware was updated. It seems like it corrupted the router.