January
I have the new NH20T hub and saw it was getting failing some DNS tests. Looks like one of the hardcoded DNS servers is timing out about 50% of the time.
DNS1: 75.152.171.67 - consistent reply. response around 2-3ms
DNS2: 75.152.171.116 - timeout around 50% of the time. when successful response time around 5-7ms
Also I really wish they would let us change the WAN dns servers. I would prefer to use know good and fast servers like google or cloudflare to avoid issues like this.
January
I don't have that hub so I can't confirm this info is correct. It may be of help:
Changing DNS servers on NAH/NH20T/FXA5000 : r/telus (reddit.com)