bind918 malfunction?

[Peter]

I have complaints about network malfunction. From the logs I can see
that a device which always regained network access within ~40 seconds,
now takes 1-2 hours to recover, and this happening almost daily.

There is a possible alignment between the start of the malfunction
and an upgrade from 9.16 to 9.18.28 (later 29).
Is there anything about 9.18 that I might need to know?

cheerio,
PMc