Latest firmware killed my Nighthawk AC1750 R6700v2

I have so many issue with this unreliable router. I have another post @ https://community.netgear.com/t5/WiFi-Range-Extenders-Repeaters/My-nightmare-has-begun-from-Nighthwak/m-p/1444481#M20761

I created a support case about it but no one has ever picked the phone.

The issue has happened after the latest firmware update. Every night it can't connect to internet and force me to reboot the router. The router lights are correct. Modem is connected to internet fine. The router UI shows internet is good. Everything looks normal but no device can get online. 4 days ago, I tried to shut down everything inclduing the modem, router, extenders then turned them on again. 3 days ago, I tried to reboot my router 2-3 times since it's randomly disconnected to internet. 2 days ago, I turned off everything again and waited for 20 minutes then turned everything back on. Yesterday, I rebooted my router. Now I did factory reset and reconfig my port forwarding and so on. I think the router is doomed. I should request a replacement but no one ever picked the phone.

I forgot my previous case number and now I have another new number 29369804.