The .1 fixed the majority of server failures I was seeing. I am still getting a few errors a hour where I used to get none. One repeat failure is "features.opera-api2.com". It is failing ever time yet it can be resolved via 1.1.1.1 etc. This is very repeatable. Here is the error it throws.
{ "Code": "EXTENDED_DNS_ERROR", "Length": "109 bytes", "Data": { "InfoCode": "Other", "ExtraText": "Resolver exception for features.opera-api2.com. A IN: Object reference not set to an instance of an object." }{ "Code": "EXTENDED_DNS_ERROR", "Length": "109 bytes", "Data": { "InfoCode": "Other", "ExtraText": "Resolver exception for features.opera-api2.com. A IN: Object reference not set to an instance of an object." }
Source: r/technitium · by /u/daviscompound