Every so often my GMail (Chrome/FF) fails to refresh. Did some sleuthing and figured out that DNS name resolution is failing. So now whenever I see a sluggish performance I run the following alias and lo behold I get the output shown below.

$ alias chk_pub_dns='for dig in 8.8.8.8 1.1.1.1 9.9.9.9; do dig @${dig} cloudflare.com; done'

(Resolvers in my /etc/resolv.conf 8.8.8.8, 1.1.1.1, and 9.9.9.9}

$ chk_pub_dns ;; communications error to 8.8.8.8#53: connection refused ;; communications error to 8.8.8.8#53: timed out ;; communications error to 8.8.8.8#53: connection refused

; <<>> DiG 9.18.12-0ubuntu0.22.04.2-Ubuntu <<>> @8.8.8.8 cloudflare.com ; (1 server found) ;; global options: +cmd ;; no servers could be reached

;; communications error to 1.1.1.1#53: timed out ;; communications error to 1.1.1.1#53: connection refused ;; communications error to 1.1.1.1#53: timed out

; <<>> DiG 9.18.12-0ubuntu0.22.04.2-Ubuntu <<>> @1.1.1.1 cloudflare.com ; (1 server found) ;; global options: +cmd ;; no servers could be reached

;; communications error to 9.9.9.9#53: connection refused ;; communications error to 9.9.9.9#53: timed out ;; communications error to 9.9.9.9#53: connection refused

; <<>> DiG 9.18.12-0ubuntu0.22.04.2-Ubuntu <<>> @9.9.9.9 cloudflare.com ; (1 server found) ;; global options: +cmd ;; no servers could be reached

Do you see similar issues with your broadband provider? Please share your experience; I am trying to figure out an ISP that does not have this issue a priori (to switch my ISP).