Hi Hamish,

> [983261.923836] NETDEV WATCHDOG: enxb827eb7194f1 (lan78xx): transmit queue 0 
> timed out
> [983261.923915] WARNING: CPU: 2 PID: 0 at net/sched/sch_generic.c:466 
> dev_watchdog+0x2b0/0x2b8
...
> [983261.924056] Hardware name: Raspberry Pi 3 Model B Plus Rev 1.3 (DT)
...
> Looks like a kernel oops?

Yes.
https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1861936/comments/43
is a recent comment on a thread about it.

> Even though the volume has the "errors=remount-rw" option, it still
> unmounts completely when this happens.  Good news is no I/O errors so
> the disk is okay at least.

‘errors=remount-rw’ is what to do when there's a media error or
something else which can be recovered.  You're suffering from a device
driver failure which knocks out a lump of software.

-- 
Cheers, Ralph.

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