I have been using Getflix (https://www.getflix.com/) for DNS service for a long time without problems until a few days ago when UK channels on my Roku 3 box stopped working. I am also getting a DNS failed on the Getflix dashboard. As Getflix suggested, reset router with new primary and secondary DNS, flushed DNS cache, turned off AVG completely, then parts that might block DNS. IPV6 disabled, all the usual stuff.
Getflix even logged in remotely but still cannot fix - eventually I was asked to check with Nethouse if they allow 3rd party DNS; they never have they said. So seems not to be any changes from ISP, so I told Getflix it must be their side.
Getflix suggested using their VPN service via OpenVPN - downloaded the software and server files and that doesn't work. We also have Nord VPN but it no longer allows you to set up on certain model router for certain models, and of course TP Link TL WR940N is one of those

Any one using Getflix had similar issues or can anyone think of a workaround please?
Thanks.