Hi, I have two droplets, each of them being on a subdomain of wlnkn.com

I followed the DO guide for adding domains. Everything worked fine for around a week or two, then suddenly I'm getting DNS errors:

Julians-Air:~ julianpatdu$ nslookup -type=cname wlnkn.com
Server:     192.168.43.1
Address:    192.168.43.1#53

** server can't find wlnkn.com: NXDOMAIN

Julians-Air:~ julianpatdu$ dig wlnkn.com +trace

; <<>> DiG 9.8.3-P1 <<>> wlnkn.com +trace
;; global options: +cmd
.           497655  IN  NS  g.root-servers.net.
.           497655  IN  NS  d.root-servers.net.
.           497655  IN  NS  k.root-servers.net.
.           497655  IN  NS  c.root-servers.net.
.           497655  IN  NS  m.root-servers.net.
.           497655  IN  NS  j.root-servers.net.
.           497655  IN  NS  b.root-servers.net.
.           497655  IN  NS  l.root-servers.net.
.           497655  IN  NS  a.root-servers.net.
.           497655  IN  NS  e.root-servers.net.
.           497655  IN  NS  i.root-servers.net.
.           497655  IN  NS  h.root-servers.net.
.           497655  IN  NS  f.root-servers.net.
;; Received 228 bytes from 192.168.43.1#53(192.168.43.1) in 845 ms

com.            172800  IN  NS  a.gtld-servers.net.
com.            172800  IN  NS  b.gtld-servers.net.
com.            172800  IN  NS  c.gtld-servers.net.
com.            172800  IN  NS  d.gtld-servers.net.
com.            172800  IN  NS  e.gtld-servers.net.
com.            172800  IN  NS  f.gtld-servers.net.
com.            172800  IN  NS  g.gtld-servers.net.
com.            172800  IN  NS  h.gtld-servers.net.
com.            172800  IN  NS  i.gtld-servers.net.
com.            172800  IN  NS  j.gtld-servers.net.
com.            172800  IN  NS  k.gtld-servers.net.
com.            172800  IN  NS  l.gtld-servers.net.
com.            172800  IN  NS  m.gtld-servers.net.
;; Received 487 bytes from 198.97.190.53#53(198.97.190.53) in 837 ms

com.            900 IN  SOA a.gtld-servers.net. nstld.verisign-grs.com. 1502232820 1800 900 604800 86400
;; Received 100 bytes from 192.55.83.30#53(192.55.83.30) in 273 ms

Julians-Air:~ julianpatdu$ dig wlnkn.com

; <<>> DiG 9.8.3-P1 <<>> wlnkn.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 60946
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;wlnkn.com.         IN  A

;; AUTHORITY SECTION:
com.            300 IN  SOA a.gtld-servers.net. nstld.verisign-grs.com. 1502232970 1800 900 604800 86400

;; Query time: 198 msec
;; SERVER: 192.168.43.1#53(192.168.43.1)
;; WHEN: Wed Aug  9 06:56:48 2017
;; MSG SIZE  rcvd: 100

Thanks