our firewall lost DNS to 45.90.28/30.165 3 times now

Sydney, Australia internet via AARNET

So, today @ 10:50, last Friday 28/10 at 9:30 and 2 weeks before that at the same time - we just lost contact with the DNS servers:

C:\>tracert 45.90.28.165

Tracing route to 45.90.28.165 over a maximum of 30 hops

  1    <1 ms    <1 ms    <1 ms  10.0.100.1

  2     2 ms    <1 ms    <1 ms  vlan248.ae0.pe1.rsby.nsw.aarnet.net.au [138.44.13.13]

  3     1 ms    <1 ms    <1 ms  et-1-1-0.bdr1.msct.nsw.aarnet.net.au [113.197.15.111]

  4    <1 ms     1 ms     1 ms  as20473.nsw.ix.asn.au [218.100.53.14]

  5     1 ms     1 ms     1 ms  10.74.5.6

  6     *        *        *     Request timed out.

  7     *        *        *     Request timed out.

  8     *        *        *     Request timed out.

  9     *        *        *     Request timed out.

10     *        *        *     Request timed out.

11     *        *        *     Request timed out.

12     *        *        *     Request timed out.

13     *        *        *     Request timed out.

... to 30 hops.

we had to change firewall & server DNS to bypass nextDNS but left a terminal open pinging until it came back up.

Not helpful couldn't find a reason for this on nextDNS's site.

Anyone else have this issue?