Back-to-back tests of my p5a and p8, same Wifi access point, same speed, show the p8 is having a number of issues with DNS.

Pinging apps.grapheneos.org on the p5a:
`~ ping apps.grapheneos.org
PING apps.grapheneos.org (51.79.74.15) 56(84) bytes of data.
64 bytes from 51.79.74.15: icmp_seq=1 ttl=42 time=87.2 ms
64 bytes from 51.79.74.15: icmp_seq=2 ttl=42 time=99.5 ms
64 bytes from 51.79.74.15: icmp_seq=3 ttl=42 time=98.1 ms
64 bytes from 51.79.74.15: icmp_seq=4 ttl=42 time=102 ms
64 bytes from 51.79.74.15: icmp_seq=5 ttl=42 time=100 ms
64 bytes from 51.79.74.15: icmp_seq=6 ttl=42 time=105 ms
64 bytes from 51.79.74.15: icmp_seq=7 ttl=42 time=99.2 ms
^C
--- apps.grapheneos.org ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6025ms
rtt min/avg/max/mdev = 87.235/98.980/105.833/5.350 ms'

Same for the p8:
'~ $ ping apps.grapheneos.org
[after 10 s] ^C
~ $ ping 51.79.74.15
PING 51.79.74.15 (51.79.74.15) 56(84) bytes of data.
64 bytes from 51.79.74.15: icmp_seq=1 ttl=42 time=123 ms
64 bytes from 51.79.74.15: icmp_seq=2 ttl=42 time=94.6 ms
64 bytes from 51.79.74.15: icmp_seq=3 ttl=42 time=96.8 ms
64 bytes from 51.79.74.15: icmp_seq=4 ttl=42 time=162 ms
64 bytes from 51.79.74.15: icmp_seq=5 ttl=42 time=112 ms
^C
--- 51.79.74.15 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4010ms
rtt min/avg/max/mdev = 94.691/118.113/162.919/24.762 ms
--'
Besides that, email from the p8 doesn't connect to my main address whereas the p5a does; and I am not getting either system update automatic updates (though pushing the button in Settings worked) or Auditor notifications.

Suggestions on what to try next, please?