Orbi Mesh WIfi 6 RBK752 DNS_PROBE_FINISHED_NXDOMAIN problem

Hi guys,

I've got a Orbi RBK752 router + satellite pack and I've upgraded its firmware to 4.6.3.7 

https://kb.netgear.com/000063818/RBR750-RBS750-Firmware-Version-4-6-3-7

I've experienced some sporadic DNS_PROBE_FINISHED_NXDOMAIN timeout since the router was firstly installed. It did not happen a lot though, usually a few times a day, nut quite noticable as we've never had this with previous router. 

After reading through a few posts online about this issue - it seems there have been a lot of people who have experienced the same/similar issue across various Orbi models. 

Based on the suggestions that were made by various people from various posts, I decided to disabled the netArmour, changed the DNS server to cloudFlare (1.1.1.1) and disabled the guest network. Then it appeared that this issue somehow had been resovled and I did not experience any DNS errors in the next few days after. However, today I've just come across this error once again though it only happened once so far. so now I am not sure if any thing I've changed has actually fixed this issue ? Or if it was because of using CloudFlare dns server results in less errors getting popped up ? 

In the release notes of firmware 4.6.3.7, it says "Fixes the DNS timeout issue", so I assume this update included a fix which is specifically for this issue ? however since I've seen error again I am not 100% confident if this update has actually fixed it or not ? Or it could just be a geniune dns timeout I've experienced though I doubt it. 

Hope if anyone could shed some light on this.

Cheers