PAW software installed is 20190621.
RPi 3b not the 3b+
I started a new thread as I believe this issue is different from my previous reporting whereby the wifi would drop out.
On this issue the wifi continues to work and (looking at wifi connections on the tablet) the tablet stays connected. However, despite apparently being connected to the wifi, I am unable to access the config pages to check the status of the PAW and either the PAW does not send information to SD or SD does not receive it. (I suspect the former due to lack of access to status pages on PAW)
This problem manifested on this particular flight but it was only 2 weeks ago I flew into France and back, about 7-8 hours over 5 flights without an issue.