In message , Adrian
 writes
>On the basis of trying the easy fixes first, I've swapped the lead and
>switch port.
>
>However that was this morning, after the overnight rsync job ran, which
>worked this time around.
>
>If that doesn't work, then next it will probably be swapping the Pi
>(but keeping the SD card).  I've got a spare Pi 2, which ought to be up
>to the job.
>

Another night, and another failure.

I've now swapped the source Pi for a spare.  Unfortunately the source
was a Pi3 and the spare is a Pi2.  In most respects, this probably isn't
a problem, but I have a BME280 (temperature/humidity/pressure) sensor
attached, and they don't seem to play nicely with Pi2s (which is
probably worthy of a whole new thread).

With it all connected up (and the router tweaked to reflect the new MAC
address), I've rerun the rsync, and it works.  However, as this is
intermittent, that proves nothing in the short term.

Adrian
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